標題: Population trapping and rotational revival of N-2 molecules during filamentation of a femtosecond laser pulse in air
作者: Azarm, A.
Ramakrishna, S.
Talebpour, A.
Hosseini, S.
Teranishi, Y.
Xu, H. L.
Kamali, Y.
Bernhardt, J.
Lin, S. H.
Seideman, T.
Chin, S. L.
應用化學系分子科學碩博班
Institute of Molecular science
公開日期: 14-Dec-2010
摘要: We study the fluorescence emitted from filaments in air using a pump-probe scheme with a femtosecond Ti-sapphire laser. The fluorescence intensities from the first negative band (B-2 Sigma(+)(u) -> X-2 Sigma(+)(g)) and the second positive band (C-3 Pi(u) -> B-3 Pi(g)) show enhancement and change periodically as a function of the pump-probe time delay. We attribute this phenomenon to the universal yet probably forgotten phenomenon of population trapping of nitrogen molecules in highly excited states together with field-induced alignment of nitrogen molecules followed by revivals of the rotational wavepackets. Theoretical calculation of the alignment dynamics of nitrogen molecules is consistent with the experimental data.
URI: http://dx.doi.org/10.1088/0953-4075/43/23/235602
http://hdl.handle.net/11536/150169
ISSN: 0953-4075
DOI: 10.1088/0953-4075/43/23/235602
期刊: JOURNAL OF PHYSICS B-ATOMIC MOLECULAR AND OPTICAL PHYSICS
Volume: 43
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