Units Conversion



      Regarding the recent inquiry on units conversion,
 > Could anyone come up with reasonable accuracy (at least 6 significant
 > figures) for
 >
 > Hartrees to Joules
 > Calories to Joules
 > Bohr     to Angstrom
 >
 > Non of my texts even have the definition of a Hartree.
 >
 > Thanks in advance
 >
 > Alex
 >
 > +--------------------------------------------------+
 > |Alternate E-mail A.J.Turner %! at !% Bath.ac.uk            |
 > |www home  %! at !%  http://www.bath.ac.uk/~chpajt/home.html|
 > +--------------------------------------------------+
      I can recommend a WWWeb site which will carry out such
 conversions interactively:
 http://www.chemie.fu-berlin.de/chemistry/general/units.html
      Instructions are given in English and German, but it is
 simple to use.  Submitting the requested conversion queries to
 this resource gave the following answers.
 1 hartree = 4.359748e-18 joule
 1 calorie = 4.1868 joule  (fewer than the requested six
                            significant figures)
 1 bohrradius = 0.5291772 angstrom
      This server is often busy, so reference to a manual will
 often provide the answer quicker.