Femtosecond resonance-enhanced multiphoton-ionization photoelectron spectrum of ammonia
- State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics, Wuhan Institute of Physics and Mathematics, Chinese Academy of Sciences, Wuhan 430071 (China)
- State Key Laboratory of Molecular Reaction Dynamics, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023 (China)
We have studied the multiphoton dissociation dynamics of the E-tilde{sup '} {sup 1}A{sub 1}{sup '} Rydberg state of ammonia (NH{sub 3}) on a homebuilt femtosecond pump-probe system by resonance-enhanced multiphoton ionization photoelectron (REMPI-PE) spectroscopy. The highly excited Rydberg state, E-tilde{sup '1} A{sub 1}{sup '}, of ammonia was accessed by two 267 nm pump photons and then ionized by a 401 nm probe pulse delayed in time. The variation of the REMPI-PE spectra of ammonia with pump-probe delay time provides valuable information on the dynamics of the excited intermediate accessed by the pump pulse. We find that the Frank-Condon preferred transition during ionization does not occur for {delta}{upsilon}{sub 1}=0 but for {delta}{upsilon}{sub 1}=1, which implies that the intermediate has a different geometry from the ionic ground state. Different dynamical behavior has been observed for each of the transitions {delta}{upsilon}{sub 1}=0,1,2,3, giving a full temporal description of the excited intermediate state by projection onto the eigenspace of the ionic ground state.
- OSTI ID:
- 20974771
- Journal Information:
- Physical Review. A, Journal Name: Physical Review. A Journal Issue: 5 Vol. 74; ISSN 1050-2947; ISSN PLRAAN
- Country of Publication:
- United States
- Language:
- English
Similar Records
Field modulation of Rydberg-state populations of NO studied by femtosecond time-resolved photoelectron imaging
Photoionization of excited molecular states using multiphoton excitation techniques