Femtosecond Real-Time Probing of Reactions. 15. Time-Dependent Coherent Alignment
The time evolution of product-state anisotropy, through absorption or fluorescence, is developed and compared with the experimental observations for three reactions involving elementary and complex dynamics. The reactions are trans-stilbene-He → trans-stilbene + He, ICN → I + CN, and Hgl_2-Hgl + I. Reagant rotation, applied torque, vibrational averaging, and dynamic axis switching are incorporated into the theoretical treatment. The theory is classical in approach, but it describes the experimental behavior on the femtosecond to picosecond time scale, which enables one to obtain the nature of the angular momentum in the final distribution, the structure of the final fragments, and the geometry of the initial complex prepared.
© 1994 American Chemical Society. Received: December 27, 1993. Abstract published in Advance ACS Abstracts, March 1, 1994. We contribute this paper to celebrate the many scientific contributions of Professor J. Jortner. His enthusiasm and creative ideas continue to stimulate the entire field of chemical physics. We wish him a very happy birthday and many more to come in the newly peaceful world! This work was supported by grants from the U.S. Air Force Office of Scientific Research and the National Science Foundation.