15min:

JIANMEI BAI, E. H. AHMED, B. BESER, Y. GUAN, A. M. LYYRA, Temple University; S. ASHMAN, C. M. WOLFE, J. HUENNEKENS, Lehigh University.

Collisional orientation transfer facilitated V-type double-resonance polarization spectroscopy technique was applied to study the A-b complex of Rb₂ and Cs₂. Since spectral congestion makes it difficult to find isolated pump transitions for heavy molecules such as Rb₂ and Cs₂, this technique significantly enlarges the range of rotational levels that can be observed per vibrational level. Collisional satellite lines with J up to 58 were observed in the Rb₂ polarization experiment. In the Cs₂ experiment, due to weaker Franck-Condon factors, collisional satellite lines with J_max equals to 12 were observed.

Collisional orientation transfer in polarization spectroscopy was first observed with buffer gas pressure of several hundred Torr. The high pressure led to loss of spectral resolution from collisional broadening. Only 1 to 3 Torr of argon buffer gas pressure was used in our experiments to obtain spectra with much higher resolution. Among the six types of possible probe signals, we assigned and analyzed the signals from the V type excitation scheme. The data was used in the global deperturbation analysis of the A-b complex of both Rb₂ and Cs₂.