https://doi.org/10.1007/s100530050109
Cusp satellite bands in the spectrum of Cs2 molecule
Institute of Physics, P.O. Box 304, 10000 Zagreb, Croatia
Corresponding author: a veza@ifs.hr
Received:
1
October
1997
Revised:
14
January
1998
Accepted:
24
February
1998
Published online: 15 April 1998
We report measurements and a theoretical explanation of the cusp-shaped
satellite bands in the blue wing of the cesium D2 resonance line which
have been observed for the first time. The bands are identified as 
transitions where the upper state dissociates
into the 6 2P
S1/2 atomic asymptote. The
experiment has been performed using a standard absorption setup, computer
controlled data acquisition and computer data processing. We have shown that
the peculiar shape of the 
difference-potential curve is solely responsible for the
spectrum containing the cusp-shaped satellite bands. The appearance of these
satellite bands has been discussed and explained relating the theory of
satellite bands to the catastrophe theory. The shape of the line wing and of
the satellite bands have been calculated using the Fourier transform
technique. To ensure a more stringent comparison between the experimental
and the theoretical spectrum, we have analyzed and compared the derivatives
of the measured and the calculated satellite band shape. On the contrary
to the customary direct comparison between the measured and the calculated
absorption coefficient, the derivative clearly shows all differences and
resemblances between satellite band profiles. The degree of coincidence of
the experimentally observed and the theoretically calculated satellite band
shape can be used as an ultimate check on the assessment of the quality of
potential-energy curves involved in the formation of satellite bands.
PACS: 33.70.Jg – Line and band widths, shapes, and shifts / 33.80.Gj – Diffuse spectra; predissociation, photodissociation / 34.20.Cf – Interatomic potentials and forces
© EDP Sciences, Società Italiana di Fisica, Springer-Verlag, 1998
