"Popa, Frank D." wrote:
>
> We did iterative solutions of large matrices on the Cray in this mode - all
> precision = 64 bits.
>
> I'm curious as to who would need 128 bits of precision?
>
Hi,
in high resolution rotational spectroscopy we had problems which could only
be solved by using quadruple precision. This ocurred with rotational spectra
of molecules containing two (or more) quadrupolar nuclei with spin >=1 at high
quantum numbers (say J=120). Transitions are measured to about 8 places, but
are differences of very large energy levels with no reasonable offset
available. To calculate the energy levels coupling of spins and angular
momentum must be taken into account.
Cheers,
V. Typke
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