Fourier Transform Emission Spectroscopy of the
The emission spectrum of ZrCl has been observed in the 1800-12 000 cm(-1) region using a Fourier transform spectrometer. The molecules were excited in a microwave discharge of a mixture of helium and a trace of ZrCl(4) vapor. In addition to the C(4)Delta-X(4)Phi transition reported previously, numerous new bands observed in the near infrared have been classified into two electronic transitions, [7.3](2)Delta-a(2)Phi and [9.4](2)Phi-a(2)Phi. Five new bands observed in the 6700-7400 cm(-1) region have been assigned as (2)Delta(3/2)-(2)Phi(5/2) and (2)Delta(5/2)-(2)Phi(7/2) subbands of a new electronic transition, [7.3](2)Delta-a(2)Phi. The two subbands of the [9.4](2)Phi-a(2)Phi transition were previously observed by G. Phillips, S. P. Davis, and D. C. Galehouse [Astrophys. J. Suppl. 43, 417-434 (1980)], who tentatively labeled them as (2)Pi(1/2)-(2)Pi(1/2) and (2)Pi(3/2)-(2)Pi(3/2) subbands. A number of new bands involving higher vibrational levels have been identified for these two subbands. A rotational analysis of a number of bands of both transitions has been obtained and spectroscopic constants have been determined. Global perturbations have been observed in both spin components of the a(2)Phi state. The assignment of the observed electronic states has been discussed in light of recent theoretical calculations. Copyright 1999 Academic Press.
Ram
RS
Department of Chemistry, University of Arizona, Tucson, Arizona, 85721
Bernath
PF