DIPOLE MOMENTS OF THE GROUND AND FIRST EXCITED VIBRATIONAL STATES OF $^{35}$C10
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Date
1985
Journal Title
Journal ISSN
Volume Title
Publisher
Ohio State University
Abstract
The analysis of atmospheric infrared absorption by C10 requires accurately determined band intensities. For the fundamental band, theoretical intensity $calculations^{1}$ give a result which is twice as large as experimental $results^{2}$. In view of this discrepancy, it is important to independently check the calculated dipole moment function with experimentally measured dipole moments. The v=0 and v=1 dipole moments of C10 were obtained using the molecular beam electric resonance technique. C10 is formed in a supersonically expanded discharge of 10-20% $O_{2}$ and 3-4% $Cl_{2}$ in an Ar buffer gas. Transitions within the $^{2}\pi_{3/2}, J=3/2$ state of $^{35}C10$ were monitored as a function of electric field up to 1600 V/cm. At zero field, this state is split into eight levels by the magnetic hyperfine structure and lambda doubling. Because the lambda doubling ($\sim 100$ kHz) is much smaller than the hyperfine splitting ($\sim 100$ MHz), the Stark effect is difficult to analyze. Observations of a large number of transitions were necessary for a definitive assignment. The tentative nature of the v=1 dipole moment arises from this difficulty. The dipole moments obtained were 1.2980 (12) D for the v=0 state and 1.2779 (19) for the v=1 state (tentative). The difference between these two measured values is 0.0201 D which is significantly lower than the theoretically predicted result of 0.028 $D^{1}$.
Description
$^{1}$S. R. Langhoff, J. P. Dix, J. O. Arnold, R. W. Nicholls and L. L. Danylewych, J. Chem. Phys. 67, 4306 (1977). $^ 2$J. R. Gillis and A. Goldman, J. Quant. Spectrosc. Radiat. Transfer 26, 23 (1981).
Author Institution: Chemistry Department, Harvard University; Chemistry Department, Harvard University; Chemistry Department, Harvard University
Author Institution: Chemistry Department, Harvard University; Chemistry Department, Harvard University; Chemistry Department, Harvard University