Abstract:
It is appropriate to mention here that this project was
originally directed by Professor Dr. M. Rafi who later on took an
assignment at King Abdul A7iz university, Jeddah and it was
assigned to the present principal investigator.
In this project, we have taken up the emission and absorption
studies of diatomic' molecules. It is known that the AE state of
alkali hydride molecules has an abnormal character. The
anharmonicity parameter (8-13) is negative for all the members of
alkali hydrides in contrast to that for the rest of the molecules.
We have, therefore, planned to carry out rotational and
vibrational study of this state (in absorption)for molecules of
hydrides of lithi.um, potassium and sodium near the dissociation
energy which has not been done earlier.
Despite the fact, that there should be a great number of
electronic states, we find that data on many molecules consist of
only few electronic states. An example is the bismuth molecule,
where very few states (4-7) are known. Also, in absorption,
molecules of lithium, potassium, bismuth, lithium-potassium have
been studied. Several new electronic states have been found in
these molecules. Band systems of hydrides of lithium, potassium
and sodium molecules have been extended to higher vibrational
states close to the dissociation limit. For these band systems
rotational and vibrational analysis have been performed. Computer
methods have been used to analyze the data.The new as well as
improved values of the molecular parameters, thus determined, have
been presented.
Preliminary data have been taken on the spectra of oxides of
aluminum, galium and indium. Also work is direced towards laser
spectroscopic techniques. In particular, an experiment is being
set up for laser induced fluorescence (LIF) spectroscopy of
diatomic molecules. For this purpose, a Czerny-Turner type
monochromator has been designed and fabricated(1).
