CCL: SV: SV: Looking for a PPP parameter set



Dear Gustavo,
 in the 1970ies Josef Michl and his collaborators investigated application of the
 PPP-CI model to the spectra of conjugated systems, focussing on extended CI
 schemes such as SECI-1 and SECI-2. You may find useful information in their
 work, see for example:
 J.W. Downing, J. Michl*, P. Jorgensen, E.W. Thulstrup, Theor. Chim. Acta 1974,
 32, 203.
 You may also find something of interest in the development of the LCOAO model,
 which may be considered as an extension of the PPP-CI model to include all
 valence electrons:
 J. Spanget-Larsen, Theor. Chem. Acc. 1997, 98, 137-153.
 Yours, Jens >--<
   ------------------------------------------------------
   JENS SPANGET-LARSEN        Office:       +45 4674 2710
   Dept. of Science           Fax:          +45 4674 3011
   Roskilde University        Mobile:       +45 2320 6246
   P.O.Box 260                E-Mail:      spanget() ruc.dk<mailto:spanget() ruc.dk>
   DK-4000 Roskilde, Denmark  Web: thiele.ruc.dk/~spanget
   ------------------------------------------------------
 ________________________________________
 Fra: owner-chemistry+spanget==ruc.dk() ccl.net
 [owner-chemistry+spanget==ruc.dk() ccl.net] p&#229; vegne af GUSTAVO
 LAUREANO COELHO DE MOURA gustavo.moura|ufpe.br [owner-chemistry() ccl.net]
 Sendt: 25. januar 2019 23:38
 Til: Jens Spanget-Larsen
 Emne: CCL: SV: Looking for a PPP parameter set
 Sent to CCL by: GUSTAVO LAUREANO COELHO DE MOURA [gustavo.moura]~[ufpe.br]
 Dear CCL Community,
 Two weeks ago, I sent a message to the list where I inquired about parameters
 for PPP excited state calculations of organic molecules.
 So far, I have received only one helpful advice from Jens Spanget-Larsen
 regarding the choice of the two-center two-electron integral equation (Ohno
 versus Mataga-Nishimoto).
 I am still looking for PPP parameters, both one- and two-center integral
 parameters. I am particularly interested in distance dependent two-center
 one-electron resonance integrals between first neighbor centers. In a first
 moment, I would settle for calculating only conjugated hydrocarbons.
 Therefore, I would be grateful if someone could point for a reference where I
 can find such a fully self-contained PPP parameter set.
 Thank you very much in advance.
 Sincerely yours,
                 Gustavo L.C. Moura
 ----- Mensagem original -----
 De: "GUSTAVO LAUREANO COELHO DE MOURA gustavo.moura ~ ufpe.br"
 <owner-chemistry-,-ccl.net>
 Para: "Moura, Gustavo L.C. " <gustavo.moura-,-ufpe.br>
 Enviadas: Sábado, 12 de janeiro de 2019 20:14:40
 Assunto: CCL: SV: Looking for a PPP parameter set
 Sent to CCL by: GUSTAVO LAUREANO COELHO DE MOURA [gustavo.moura|-|ufpe.br]
 Dear Jens,
 Thank you very much for your input.
 I have been employing a CI approach that includes more than single excitations
 in the calculations and I have observed that, in agreement with your info, I get
 better results with the OH equation.
 Regarding the resonance integrals, I have been using a parameter set that
 employs a linear relationship between first neighbors bond lengths and beta. I
 have no plans of going beyond first neighbors for the resonance integrals.
 In the end, what I am searching is a fully self-contained PPP parameter set. One
 that does not employ different parameters or equations from different sources.
 Sincerely yours,
                 Gustavo L.C. Moura
 ----- Mensagem original -----
 De: "Jens Spanget-Larsen spanget^^ruc.dk"
 <owner-chemistry##ccl.net>
 Para: "Moura, Gustavo L.C. " <gustavo.moura##ufpe.br>
 Enviadas: Sábado, 12 de janeiro de 2019 6:42:35
 Assunto: CCL: SV: Looking for a PPP parameter set
 Dear Gustavo!
 Whether you use MN or OH two-center electron repulsion integrals does not depend
 so much on the other PPP parameters. The choice depends primarily on the
 configuration interaction (CI) expansion. If the expansion is limited to singly
 excited configurations (CIS), the strongly screened MN integrals tend to be
 adequate. But if you include doubly or higher excited configurations, thereby
 explicitly introducing terms in electron correlation, the less screened OH
 integrals are more appropriate.
 You want to include distance depending resonance integrals (beta's). Let me just
 mention that if you include resonance integrals between 'non-bonded' centers,
 thereby abandoning the tight-binding approximation, you break the spirit of the
 PPP concept.
 Yours, Jens >--<
 ------------------------------------------------------
 JENS SPANGET-LARSEN              Office: +45 4674 2710
 Dept. of Science                 Fax: +45 4674 3011
 Roskilde University              Mobile: +45 2320 6246
 P.O.Box 260                      Mail: spanget]|[ruc.dk
 DK-4000 Roskilde, Denmark  Web: thiele.ruc.dk/~spanget
 ------------------------------------------------------
 ________________________________________
 Fra: owner-chemistry+spanget==ruc.dk]|[ccl.net
 [owner-chemistry+spanget==ruc.dk]|[ccl.net] p&#229; vegne af Gustavo L.C.
 Moura gustavo.moura(0)ufpe.br [owner-chemistry]|[ccl.net]
 Sendt: 12. januar 2019 01:19
 Til: Jens Spanget-Larsen
 Emne: CCL: Looking for a PPP parameter set
 Sent to CCL by: "Gustavo L.C. Moura" [gustavo.moura^ufpe.br]
 Dear CCL Community,
 For the continuation of my studies on excited states of organic molecules, I
 have been looking for a set of Pariser-Parr-Pople parameters.
 I have already searched on Google and, so far, have not found a PPP parameter
 set that suits my needs.
 My main problem is with the two-center part of the Hamiltonian. First, I found
 out that the choice between the Ohno (OH) or the Mataga-Nishimoto (MN) equations
 for gamma affect my results a lot. Therefore, I need a parameter set where the
 choice between OH or MN equations has already been made. Second, I would like to
 have resonance integrals that depend on the distance between the atoms (not a
 constant as I have found in some places).
 I will be very grateful if someone out there points me in the right direction.
 Sincerely yours,
 Gustavo L.C. Mourahttp://www.ccl.net/cgi-bin/ccl/send_ccl_messagehttp-:-//www.ccl.net/chemistry/sub_unsub.shtmlhttp-:-//www.ccl.net/spammers.txt--_000_A94E15A372E6194CA8719D62642F674401374B5E80MBX2adrucdk_
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 <div>Dear Gustavo!</div>
 <div>&nbsp;&nbsp;</div>
 <div>Whether you use MN or OH two-center electron repulsion integrals does
 not depend so much on the other PPP parameters. The choice depends primarily on
 the configuration interaction (CI) expansion. If the expansion is limited to
 singly excited configurations
  (CIS), the strongly screened MN integrals tend to be adequate. But if you
 include doubly or higher excited configurations, thereby explicitly introducing
 terms in electron correlation, the less screened OH integrals are more
 appropriate.&nbsp;</div>
 <div><br>
 </div>
 <div>You want to include distance depending resonance integrals (beta's).
 Let me just mention that if you include resonance integrals between 'non-bonded'
 centers, thereby abandoning the tight-binding approximation, you break the
 spirit of the PPP concept.</div>
 <div><br>
 </div>
 <div>Yours, Jens &gt;--&lt; &nbsp;</div>
 <div><br>
 </div>
 ------------------------------------------------------<br>
 JENS SPANGET-LARSEN &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;
 &nbsp;&nbsp; Office: &#43;45 4674 2710<br>
 Dept. of Science &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;
 &nbsp; &nbsp; &nbsp; Fax: &#43;45 4674 3011<br>
 Roskilde University &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;
 &nbsp;&nbsp; Mobile: &#43;45 2320 6246<br>
 P.O.Box 260 &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;
 &nbsp; &nbsp; &nbsp; &nbsp;&nbsp; Mail:
 spanget]|[ruc.dk<br>
 DK-4000 Roskilde, Denmark&nbsp; Web: thiele.ruc.dk/~spanget<br>
 ------------------------------------------------------<br>
 <br>
 ________________________________________<br>
 Fra: owner-chemistry&#43;spanget==ruc.dk]|[ccl.net
 [owner-chemistry&#43;spanget==ruc.dk]|[ccl.net] p&amp;#229; vegne af
 Gustavo L.C. Moura gustavo.moura(0)ufpe.br [owner-chemistry]|[ccl.net]<br>
 Sendt: 12. januar 2019 01:19<br>
 Til: Jens Spanget-Larsen<br>
 Emne: CCL: Looking for a PPP parameter set<br>
 <br>
 Sent to CCL by: &quot;Gustavo L.C. Moura&quot;
 [gustavo.moura^ufpe.br]<br>
 Dear CCL Community,<br>
 For the continuation of my studies on excited states of organic molecules, I
 have been looking for a set of Pariser-Parr-Pople parameters.<br>
 I have already searched on Google and, so far, have not found a PPP parameter
 set that suits my needs.<br>
 My main problem is with the two-center part of the Hamiltonian. First, I found
 out that the choice between the Ohno (OH) or the Mataga-Nishimoto (MN) equations
 for gamma affect my results a lot. Therefore, I need a parameter set where the
 choice between OH
  or MN equations has already been made. Second, I would like to have resonance
 integrals that depend on the distance between the atoms (not a constant as I
 have found in some places).<br>
 I will be very grateful if someone out there points me in the right
 direction.<br>
 Sincerely yours,<br>
 Gustavo L.C. Moura<br>
 <br>
 <br>
 <br<br<br=<br<br>
 <br<br<br>
 <br<br<br>
 <br>
 Subscribe/Unsubscribe:<br<br>
 <br<br>
 <br>
 Job: http://www.ccl.net/jobs<br<br>;
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 </div>
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 <font size="2" face="Courier New">Dear
 Gustavo,<br>
 <br>
 in the 1970ies Josef Michl and his collaborators investigated application of the
 PPP-CI model to the spectra of conjugated systems, focussing on extended CI
 schemes such as SECI-1 and SECI-2. You may find useful information in their
 work, see for example:<br>
 <br>
 J.W. Downing, J. Michl*, P. Jorgensen, E.W. Thulstrup, Theor. Chim. Acta 1974,
 32, 203.<br>
 <br>
 You may also find something of interest in the development of the LCOAO model,
 which&nbsp;may be considered as an extension of the PPP-CI model to include
 all valence electrons:
 <br>
 <br>
 J. Spanget-Larsen, Theor. Chem. Acc. 1997, 98, 137-153.<br>
 <br>
 Yours, Jens &gt;--&lt;<br>
 <br>
 &nbsp; ------------------------------------------------------<br>
 &nbsp; JENS
 SPANGET-LARSEN&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
 Office:&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &#43;45
 4674 2710<br>
 &nbsp; Dept. of
 Science&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
 Fax:&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
 &#43;45 4674 3011<br>
 &nbsp; Roskilde
 University&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
 Mobile:&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &#43;45
 2320 6246<br>
 &nbsp; P.O.Box
 260&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
 E-Mail:&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <a href="mailto:spanget()
 ruc.dk">spanget() ruc.dk</a><br>
 &nbsp; DK-4000 Roskilde, Denmark&nbsp; Web:
 thiele.ruc.dk/~spanget<br>
 &nbsp; ------------------------------------------------------<br>
 ________________________________________<br>
 Fra: owner-chemistry&#43;spanget==ruc.dk() ccl.net
 [owner-chemistry&#43;spanget==ruc.dk() ccl.net] p&amp;#229; vegne af
 GUSTAVO LAUREANO COELHO DE MOURA gustavo.moura|ufpe.br [owner-chemistry()
 ccl.net]<br>
 Sendt: 25. januar 2019 23:38<br>
 Til: Jens Spanget-Larsen<br>
 Emne: CCL: SV: Looking for a PPP parameter set<br>
 <br>
 Sent to CCL by: GUSTAVO LAUREANO COELHO DE MOURA
 [gustavo.moura]~[ufpe.br]<br>
 Dear CCL Community,<br>
 Two weeks ago, I sent a message to the list where I inquired about parameters
 for PPP excited state calculations of organic molecules.<br>
 So far, I have received only one helpful advice from Jens Spanget-Larsen
 regarding the choice of the two-center two-electron integral equation (Ohno
 versus Mataga-Nishimoto).<br>
 I am still looking for PPP parameters, both one- and two-center integral
 parameters. I am particularly interested in distance dependent two-center
 one-electron resonance integrals between first neighbor centers. In a first
 moment, I would settle for calculating
  only conjugated hydrocarbons.<br>
 Therefore, I would be grateful if someone could point for a reference where I
 can find such a fully self-contained PPP parameter set.<br>
 Thank you very much in advance.<br>
 Sincerely yours,<br>
 &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
 Gustavo L.C. Moura<br>
 <br>
 ----- Mensagem original -----<br>
 De: &quot;GUSTAVO LAUREANO COELHO DE MOURA gustavo.moura ~ ufpe.br&quot;
 &lt;owner-chemistry-,-ccl.net&gt;<br>
 Para: &quot;Moura, Gustavo L.C. &quot;
 &lt;gustavo.moura-,-ufpe.br&gt;<br>
 Enviadas: Sábado, 12 de janeiro de 2019 20:14:40<br>
 Assunto: CCL: SV: Looking for a PPP parameter set<br>
 <br>
 Sent to CCL by: GUSTAVO LAUREANO COELHO DE MOURA
 [gustavo.moura|-|ufpe.br]<br>
 Dear Jens,<br>
 Thank you very much for your input.<br>
 I have been employing a CI approach that includes more than single excitations
 in the calculations and I have observed that, in agreement with your info, I get
 better results with the OH equation.<br>
 Regarding the resonance integrals, I have been using a parameter set that
 employs a linear relationship between first neighbors bond lengths and beta. I
 have no plans of going beyond first neighbors for the resonance
 integrals.<br>
 In the end, what I am searching is a fully self-contained PPP parameter set. One
 that does not employ different parameters or equations from different
 sources.<br>
 Sincerely yours,<br>
 &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
 Gustavo L.C. Moura<br>
 <br>
 <br>
 <br>
 ----- Mensagem original -----<br>
 De: &quot;Jens Spanget-Larsen spanget^^ruc.dk&quot;
 &lt;owner-chemistry##ccl.net&gt;<br>
 Para: &quot;Moura, Gustavo L.C. &quot;
 &lt;gustavo.moura##ufpe.br&gt;<br>
 Enviadas: Sábado, 12 de janeiro de 2019 6:42:35<br>
 Assunto: CCL: SV: Looking for a PPP parameter set<br>
 <br>
 Dear Gustavo!<br>
 <br>
 Whether you use MN or OH two-center electron repulsion integrals does not depend
 so much on the other PPP parameters. The choice depends primarily on the
 configuration interaction (CI) expansion. If the expansion is limited to singly
 excited configurations
  (CIS), the strongly screened MN integrals tend to be adequate. But if you
 include doubly or higher excited configurations, thereby explicitly introducing
 terms in electron correlation, the less screened OH integrals are more
 appropriate.<br>
 <br>
 You want to include distance depending resonance integrals (beta's). Let me just
 mention that if you include resonance integrals between 'non-bonded' centers,
 thereby abandoning the tight-binding approximation, you break the spirit of the
 PPP concept.<br>
 <br>
 Yours, Jens &gt;--&lt;<br>
 <br>
 ------------------------------------------------------<br>
 JENS
 SPANGET-LARSEN&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
 Office: &#43;45 4674 2710<br>
 Dept. of
 Science&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
 Fax: &#43;45 4674 3011<br>
 Roskilde
 University&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
 Mobile: &#43;45 2320 6246<br>
 P.O.Box
 260&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
 Mail: spanget]|[ruc.dk<br>
 DK-4000 Roskilde, Denmark&nbsp; Web: thiele.ruc.dk/~spanget<br>
 ------------------------------------------------------<br>
 <br>
 ________________________________________<br>
 Fra: owner-chemistry&#43;spanget==ruc.dk]|[ccl.net
 [owner-chemistry&#43;spanget==ruc.dk]|[ccl.net] p&amp;#229; vegne af
 Gustavo L.C. Moura gustavo.moura(0)ufpe.br [owner-chemistry]|[ccl.net]<br>
 Sendt: 12. januar 2019 01:19<br>
 Til: Jens Spanget-Larsen<br>
 Emne: CCL: Looking for a PPP parameter set<br>
 <br>
 Sent to CCL by: &quot;Gustavo L.C. Moura&quot;
 [gustavo.moura^ufpe.br]<br>
 Dear CCL Community,<br>
 For the continuation of my studies on excited states of organic molecules, I
 have been looking for a set of Pariser-Parr-Pople parameters.<br>
 I have already searched on Google and, so far, have not found a PPP parameter
 set that suits my needs.<br>
 My main problem is with the two-center part of the Hamiltonian. First, I found
 out that the choice between the Ohno (OH) or the Mataga-Nishimoto (MN) equations
 for gamma affect my results a lot. Therefore, I need a parameter set where the
 choice between OH
  or MN equations has already been made. Second, I would like to have resonance
 integrals that depend on the distance between the atoms (not a constant as I
 have found in some places).<br>
 I will be very grateful if someone out there points me in the right
 direction.<br>
 Sincerely yours,<br>
 Gustavo L.C. Mourahttp://www.ccl.net/cgi-bin/ccl/send_ccl_messagehttp-:-//www.ccl.net/chemistry/sub_unsub.shtmlhttp-:-//www.ccl.net/spammers.txt--_000_A94E15A372E6194CA8719D62642F674401374B5E80MBX2adrucdk_<br>;
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 &lt;div&gt;Dear Gustavo!&lt;/div&gt;<br>
 &lt;div&gt;&amp;nbsp;&amp;nbsp;&lt;/div&gt;<br>
 &lt;div&gt;Whether you use MN or OH two-center electron repulsion
 integrals does not depend so much on the other PPP parameters. The choice
 depends primarily on the configuration interaction (CI) expansion. If the
 expansion is limited to singly excited configurations<br>
 &nbsp;(CIS), the strongly screened MN integrals tend to be adequate. But if
 you include doubly or higher excited configurations, thereby explicitly
 introducing terms in electron correlation, the less screened OH integrals are
 more appropriate.&amp;nbsp;&lt;/div&gt;<br>
 &lt;div&gt;&lt;br&gt;<br>
 &lt;/div&gt;<br>
 &lt;div&gt;You want to include distance depending resonance integrals
 (beta's). Let me just mention that if you include resonance integrals between
 'non-bonded' centers, thereby abandoning the tight-binding approximation, you
 break the spirit of the PPP concept.&lt;/div&gt;<br>
 &lt;div&gt;&lt;br&gt;<br>
 &lt;/div&gt;<br>
 &lt;div&gt;Yours, Jens &amp;gt;--&amp;lt;
 &amp;nbsp;&lt;/div&gt;<br>
 &lt;div&gt;&lt;br&gt;<br>
 &lt;/div&gt;<br>
 ------------------------------------------------------&lt;br&gt;<br>
 JENS SPANGET-LARSEN &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp;
 &amp;nbsp; &amp;nbsp;&amp;nbsp; Office: &amp;#43;45 4674
 2710&lt;br&gt;<br>
 Dept. of Science &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp;
 &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; Fax: &amp;#43;45
 4674 3011&lt;br&gt;<br>
 Roskilde University &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp;
 &amp;nbsp; &amp;nbsp;&amp;nbsp; Mobile: &amp;#43;45 2320
 6246&lt;br&gt;<br>
 P.O.Box 260 &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp;
 &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp; &amp;nbsp;
 &amp;nbsp;&amp;nbsp; Mail: spanget]|[ruc.dk&lt;br&gt;<br>
 DK-4000 Roskilde, Denmark&amp;nbsp; Web:
 thiele.ruc.dk/~spanget&lt;br&gt;<br>
 ------------------------------------------------------&lt;br&gt;<br>
 &lt;br&gt;<br>
 ________________________________________&lt;br&gt;<br>
 Fra: owner-chemistry&amp;#43;spanget==ruc.dk]|[ccl.net
 [owner-chemistry&amp;#43;spanget==ruc.dk]|[ccl.net] p&amp;amp;#229;
 vegne af Gustavo L.C. Moura gustavo.moura(0)ufpe.br
 [owner-chemistry]|[ccl.net]&lt;br&gt;<br>
 Sendt: 12. januar 2019 01:19&lt;br&gt;<br>
 Til: Jens Spanget-Larsen&lt;br&gt;<br>
 Emne: CCL: Looking for a PPP parameter set&lt;br&gt;<br>
 &lt;br&gt;<br>
 Sent to CCL by: &amp;quot;Gustavo L.C. Moura&amp;quot;
 [gustavo.moura^ufpe.br]&lt;br&gt;<br>
 Dear CCL Community,&lt;br&gt;<br>
 For the continuation of my studies on excited states of organic molecules, I
 have been looking for a set of Pariser-Parr-Pople
 parameters.&lt;br&gt;<br>
 I have already searched on Google and, so far, have not found a PPP parameter
 set that suits my needs.&lt;br&gt;<br>
 My main problem is with the two-center part of the Hamiltonian. First, I found
 out that the choice between the Ohno (OH) or the Mataga-Nishimoto (MN) equations
 for gamma affect my results a lot. Therefore, I need a parameter set where the
 choice between OH<br>
 &nbsp;or MN equations has already been made. Second, I would like to have
 resonance integrals that depend on the distance between the atoms (not a
 constant as I have found in some places).&lt;br&gt;<br>
 I will be very grateful if someone out there points me in the right
 direction.&lt;br&gt;<br>
 Sincerely yours,&lt;br&gt;<br>
 Gustavo L.C. Moura&lt;br&gt;<br>
 &lt;br&gt;<br>
 &lt;br&gt;<br>
 &lt;br&lt;br&lt;br=&lt;br&lt;br&gt;<br>
 &lt;br&lt;br&lt;br&gt;<br>
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