Population trapping and rotational revival of N2 molecules during filamentation of a femtosecond laser pulse in air

A. Azarm; S. Ramakrishna; A. Talebpour; S. Hosseini; Y. Teranishi; H. L. Xu; Y. Kamali; J. Bernhardt; S. H. Lin; T. Seideman; S. L. Chin

doi:10.1088/0953-4075/43/23/235602

Population trapping and rotational revival of N₂ molecules during filamentation of a femtosecond laser pulse in air

A. Azarm^*, S. Ramakrishna, A. Talebpour, S. Hosseini, Y. Teranishi, H. L. Xu, Y. Kamali, J. Bernhardt, S. H. Lin, T. Seideman, S. L. Chin

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

16 Scopus citations

Abstract

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 (B²σ⁺_u→ X²σ⁺_g ) and the second positive band (C³π_u→B³π_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.

Original language	English (US)
Article number	235602
Journal	Journal of Physics B: Atomic, Molecular and Optical Physics
Volume	43
Issue number	23
DOIs	https://doi.org/10.1088/0953-4075/43/23/235602
State	Published - Dec 14 2010

ASJC Scopus subject areas

Atomic and Molecular Physics, and Optics
Condensed Matter Physics

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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. (2010). Population trapping and rotational revival of N₂ molecules during filamentation of a femtosecond laser pulse in air. Journal of Physics B: Atomic, Molecular and Optical Physics, 43(23), Article 235602. https://doi.org/10.1088/0953-4075/43/23/235602

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title = "Population trapping and rotational revival of N2 molecules during filamentation of a femtosecond laser pulse in air",

abstract = "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 (B2σ+u→ X2σ+g ) and the second positive band (C3πu→B3πg) 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.",

author = "A. Azarm and S. Ramakrishna and A. Talebpour and S. Hosseini and Y. Teranishi and Xu, {H. L.} and Y. Kamali and J. Bernhardt and Lin, {S. H.} and T. Seideman and Chin, {S. L.}",

year = "2010",

month = dec,

day = "14",

doi = "10.1088/0953-4075/43/23/235602",

language = "English (US)",

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journal = "Journal of Physics B: Atomic, Molecular and Optical Physics",

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Azarm, A, Ramakrishna, S, Talebpour, A, Hosseini, S, Teranishi, Y, Xu, HL, Kamali, Y, Bernhardt, J, Lin, SH, Seideman, T & Chin, SL 2010, 'Population trapping and rotational revival of N₂ molecules during filamentation of a femtosecond laser pulse in air', Journal of Physics B: Atomic, Molecular and Optical Physics, vol. 43, no. 23, 235602. https://doi.org/10.1088/0953-4075/43/23/235602

TY - JOUR

T1 - Population trapping and rotational revival of N2 molecules during filamentation of a femtosecond laser pulse in air

AU - Azarm, A.

AU - Ramakrishna, S.

AU - Talebpour, A.

AU - Hosseini, S.

AU - Teranishi, Y.

AU - Xu, H. L.

AU - Kamali, Y.

AU - Bernhardt, J.

AU - Lin, S. H.

AU - Seideman, T.

AU - Chin, S. L.

PY - 2010/12/14

Y1 - 2010/12/14

N2 - 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 (B2σ+u→ X2σ+g ) and the second positive band (C3πu→B3πg) 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.

AB - 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 (B2σ+u→ X2σ+g ) and the second positive band (C3πu→B3πg) 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.

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UR - http://www.scopus.com/inward/citedby.url?scp=78649811260&partnerID=8YFLogxK

U2 - 10.1088/0953-4075/43/23/235602

DO - 10.1088/0953-4075/43/23/235602

M3 - Article

AN - SCOPUS:78649811260

SN - 0953-4075

VL - 43

JO - Journal of Physics B: Atomic, Molecular and Optical Physics

JF - Journal of Physics B: Atomic, Molecular and Optical Physics

IS - 23

M1 - 235602

ER -

Population trapping and rotational revival of N₂ molecules during filamentation of a femtosecond laser pulse in air

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