The selective population of the vibrational levels of thioformaldehyde
Abstract
The simulation of the selective excitation of the vibrational levels of the electronic ground state of H2CS by femtosecond coherent light pulses was investigated. The simulation model was based on the development of the time-dependent wavefunction in terms of the stationary vibrational eigenstates. The dipole moment and the potential energy functions were obtained ab initio and approximated by polynomial expansions. Chirped and non-chirped linear polarized pulses were tried as well as circularly polarized pulses. If the target vibrational level was not involved in resonances a selectivity of more than 60% was achieved. In several cases the target state was 100% populated. Different ways of achieving the population were investigated.