Spectroscopy of metastable species in a free-jet expansion: The D’←A’ transition of I2

Zheng, Xiaonan; Fei, Suli; Heaven, Michael C.; Tellinghuisen, Joel
April 1992
Journal of Chemical Physics;4/1/1992, Vol. 96 Issue 7, p4877
Academic Journal
The A’2u 3Π state of I2 is observed in a free-jet expansion of I2 in Ar, where it is prepared by ArF laser irradiation. Laser excitation spectra are recorded for 37 bands in the υ’←0‘ progression of the D’2g(3P2)←A’ transition. The spectra display rotational temperatures of ∼5 K. At the 0.08 cm-1 resolution of the probe laser, rotational congestion near the band origins necessitates analysis by a nonlinear least-squares contour simulation method. Subsequent correlated fits of the band-by-band results are combined with other results to produce global constants valid for υ’=0–86, υ‘=0–32.


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