Control of Landau-Zener transition in NaI predissociation with chirped femtosecond laser pulses
Department of Physics and State Key Laboratory for Mesoscopic Physics, Peking University - Beijing, 100871, PRC
Received: 7 January 2013
Accepted: 11 March 2013
We explore the control of the Landau-Zener (LZ) transition in NaI predissociation with low-intensity linearly and quadratically chirped femtosecond far-infrared laser pulses by solving the coupled time-dependent Schrödinger equations. We find that the LZ transition between the excited state and the ground state can be enhanced or be suppressed using a well-delayed control pulse with a proper linear or quadratic chirp. With instantaneously controlling the energy gap, the resonant population inversion induced by Rabi oscillation can facilitate or prohibit the molecular population transfer in the avoided-crossing region. This work provides a deep understanding of coherent control of LZ transition in molecular reaction with chirped femtosecond laser pulses.
PACS: 82.50.Nd – Control of photochemical reactions / 42.50.Hz – Strong-field excitation of optical transitions in quantum systems; multiphoton processes; dynamic Stark shift / 33.80.Gj – Diffuse spectra; predissociation, photodissociation
© EPLA, 2013