Robin, that is not my understanding. The values are from GE nuclear
Energy 15 Edition that give the mass of the nucleus. The mass is not
only obtained using a mass spectrometer. It is obtained by IUPAC using
a complex evaluation based on nuclear decay and energy measurements as
well. The mass spectrometer can not give the number of significant
figures to which these values are given.
Ed
On Mar 15, 2013, at 2:34 PM, [email protected] wrote:
In reply to Edmund Storms's message of Thu, 14 Mar 2013 22:04:51
-0600:
Hi Ed,
[snip]
Robin, according to my tables, the mass of a bare d is 2.014101778,
which is the value I used. I don't know where you got the idea an
electron is involved. These are nuclear reactions.
Ed
Your table is correct, however your interpretation of it is not. The
mass quoted
is that of a D atom, i.e. the nucleus plus it's electron.
(See http://atom.kaeri.re.kr/ton/nuc1.html for atomic masses.)
Most publicly available tables provide atomic masses. That's because
the mass is
determined using a mass spectrometer which in turn "measures" the
mass of ions
with a single positive charge, then the mass of an electron is added
to yield
that of the whole atom.
It's difficult to create completely ionized nuclei, to allow
measurement of the
actual *nuclear* mass, and it gets more difficult as the atomic number
increases. Hence the approach used, and the form of the tables.
Regards,
Robin van Spaandonk
http://rvanspaa.freehostia.com/project.html
