Subject: Re:CCL:vibrational structure in the photoelectronspectrum

From: "6!Q8@W" <dxl=at=mail.ustc.edu.cn>
Date: Wed, 10 Mar 2004 9:14:28 +0800

Dear CCLs#:

    Thank you for your help!!!!!!!!!!!!!!!!!

The vibrational temperature of the clusters is estimated to
be about room temperature. A UV laser pulse (hv=4.66 eV) is
used in the experiment.

When the geometry of the neutral molecule are much different 
> from the anionic molecule, on the assumption that vertical detachment happens,
the vibration of the neutral molecule at its equilibrium geometry, I think, 
will be much different from the experiment data.
According  to our calculation data,  the vibration frequency on PES is between
that of the neutral and anionic molecules.

!!!!!!!!!!!!!!!!!!!!!!!!!!!!Ding Xunlei
!!!!!!!!!!!!!!!!!!!!!!!!!!!!2004-03-10
______________________________________________
Ding Xunlei, Ph.D. Candidate
Open Laboratory of Bond Selective Chemistry
University of Science & Technology of China
Hefei, Anhui 230026, P.R.China
Tel.: 0086-551-3603418
Fax.: 0086-551-3602969
E-mail: dxl=at=mail.ustc.edu.cn
Http://www.bsc.ustc.edu.cn/~dxl
======= 2004-03-09 15:14:00 You have written: =======

>Dear Mr. Ding,
>
>Usually this depends on your experimental condition. 
>In principle, if you used helium gas expansion to cool your anions 
>and did it in the right way, the anions should be at ground state.
>Therefore, the vibrational structures on the PES should correspond 
>to the neutral.
>
>People can observe some vibrational structures of the anions when 
>the source condition is not cold enough. This is so called hot 
>band, which shows up at the low electron binding energy side of the 
>spectrum. Usually, people need some skill in tuning the source 
>condition to get rid of the hot band. 
>
>The best way to find out whether the vibrational structures are from the 
>anions or the neutral or both is to look at the change of the spectrum 
>at difference source conditions. 
>
>Best Wishes,
>
>Weijun
>
>***************************************************
>Weijun Zheng
>Department of Chemistry
>Johns Hopkins University
>3400 N. Charles Street
>Baltimore, MD 21218
>Homepage: http://jhunix.hcf.jhu.edu/~wz13
>*****************************************************
>
>----- T-SJ<~ -----
>4S: "6!Q8@W" <dxl=at=mail.ustc.edu.cn>
>HUFZ: PGFZ6~, H}TB 9HU, 2004 IONg0:15
>VwLb: CCL:vibrational structure in the photoelectron spectrum
>
>> Dear CCL#:
>> 
>> !!!!We can get the vibrational structure in the photoelectron 
>> spectrum (PES) of an anion molecule .
>> I want to know which the vibration is corresponding to, the 
>> vibration of the anionic or of the 
>> neutral molecule, or maybe both of them?
>> 
>>    Thank you for your help!!!!!!!!!!!!!!!!!
>>                         	
>> !!!!!!!!!!!!!!!!!!!!!!!!!!!!Ding Xunlei
>> !!!!!!!!!!!!!!!!!!!!!!!!!!!!2004-03-09
>> ______________________________________________
>> Ding Xunlei, Ph.D. Candidate
>> Open Laboratory of Bond Selective Chemistry
>> University of Science & Technology of China
>> Hefei, Anhui 230026, P.R.China
>> Tel.: 0086-551-3603418
>> Fax.: 0086-551-3602969
>> E-mail: dxl=at=mail.ustc.edu.cn
>> Http://www.bsc.ustc.edu.cn/~dxl
>> 
>> 
>> 
>> 
>> 
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>
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