A Theoretical Study of the Dynamics of Vibrational Wave Packets in the 1g State Of Xe2

J F Castillo,K L Reid

doi:10.1155/1999/49417

Abstract

We present a theoretical description of the dynamics of vibrational wave packets in the 1g state of Xe2. As an illustration, a simulation of a picosecond pump excitation-probe ionization laser experiment is carried out. The initial wavepacket is calculated using an explicit modelling of the short-pulse excitation process and propagated for up to 160 picoseconds. Evidence of fractional and full revivals of the wavepacket has been found and analyzed. The time delayed ionization signal is simulated using first order perturbation theory and shows clear oscillations corresponding to the temporal development of the wavepacket.

Highlights

In recent years there has been considerable interest in time-resolved experiments by means of ultrashort laser pulses
The ionization signal will show oscillations that reflect the fact that the vibrational overlap between the wavepacket and vibrational levels of the molecular ion depends on time
Xe2 and Xe-(A2u) states is AR4.2 a0 which implies a very narrow Franck-Condon detection window, the ionization signal must oscillate as function of the time delay, (3) Xe2 is an interesting system for observing high order fractional revivals only so far observed for Br2 [9]

Summary

A THEORETICAL STUDY OF THE DYNAMICS OF VIBRATIONAL WAVE

We present a theoretical description of the dynamics of vibrational wave packets in the lg state of Xe2. A simulation of a picosecond pump excitation-probe ionization laser experiment is carried out. The initial wavepacket is calculated using an explicit modelling of the short-pulse excitation process and propagated for up to 160picoseconds. Evidence of fractional and full revivals of the wavepacket has been found and analyzed. The time delayed ionization signal is simulated using first order perturbation theory and shows clear oscillations corresponding to the temporal development of the wavepacket

INTRODUCTION

THEORY

RESULTS AND DISCUSSION

CONCLUSIONS