The mechanism of nitrogen fluorescence inside a femtosecond laser filament in air

Xu, Huailiang; Azarm, A.; Bernhardt, J.; Kamali, Y.; Chin, See Leang

doi:10.1016/j.chemphys.2009.05.001

Cited by 139 publications

(102 citation statements)

References 30 publications

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“…The corresponding pathways may therefore be activated by photodissociation, ionization, or electron impact onto O 2 and N 2 molecules. The very complex chemistry occurring in air plasmas 21,22 prevents us to isolate one single scheme, although three of them are more likely to contribute significantly to the formation of NO. The first one relies on the N + ions, which are highly reactive with O 2 , with a rate constant as high as 5 ϫ 10 −10 cm 3 / s at 300 K. Note that, throughout this work, we use of the rate constants at room temperature because the filaments are known to negligibly heat the heavy species of the plasma.…”

Section: ͑5͒mentioning

confidence: 99%

Production of ozone and nitrogen oxides by laser filamentation

Petit¹,

Henin²,

Kasparian³

et al. 2010

Applied Physics Letters

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We have experimentally measured that laser filaments in air generate up to 1014, 3×1012, and 3×1013 molecules of O3, NO, and NO2, respectively. The corresponding local concentrations in the filament active volume are 1016, 3×1014, and 3×1015 cm−3, and allows efficient oxidative chemistry of nitrogen, resulting in concentrations of HNO3 in the parts per million range. The latter forming binary clusters with water, our results provide a plausible pathway for the efficient nucleation recently observed in laser filaments

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Section: ͑5͒mentioning

confidence: 99%

Production of ozone and nitrogen oxides by laser filamentation

Petit¹,

Henin²,

Kasparian³

et al. 2010

Applied Physics Letters

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“…Also, the THz pulse could either further field ionize directly the trapped high-lying Rydberg states or heat the free electrons first which then impact-ionized these trapped states. The consequence was that the ion population was increased, which resulted in the enhancement of the fluorescence from the neutral N 2 molecules or molecular ions [49] . The higher the THz field was, the stronger the fluorescence would be.…”

Section: Remote Thz Detectionmentioning

confidence: 99%

Intense broadband THz generation from femtosecond laser filamentation

Wang¹,

Yuan²,

Chen³

et al. 2013

中国光学快报

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Broadband and energetic terahertz (THz) pulses can be remotely generated in air through filamentation. We review such THz generation and detection in femtosecond Ti-sapphire laser induced remote filaments. New results are presented on the direct relationship between THz generation in a two color filament and induced N2 fluorescence through population trapping during molecular alignment and revival in air. This further supports the new technique of remote THz detection in air through the sensitive measurement of N2 fluorescence.

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“…N + 2 + N 2 → N + 4 ; N + 4 + e → N * 2 + N 2 ; N * 2 → N 2 + hν (337, 357, 380 nm etc.) [38] , excited N 2 can be populated, leading to N 2 fluorescence emission. Hence, any increase in the fluorescence from N 2 , such as the 337 nm line, would indicate an increase in the number of N + 2 ; i.e.…”

Section: Fluorescencementioning

confidence: 99%

“…When the high-voltage electric field through the electrode was applied to the filament, more free electrons inside the hot filament zone would be accelerated towards the electrode, enhancing the ionization along the laser filament. This would enhance the neutral N 2 fluorescence through collisional processes [38] . In the case of fixed filamenting pulse energy, a higher CD voltage will provide a stronger electric field.…”

Section: Fluorescencementioning

confidence: 99%

“…Figure 4(a) (Ref. [37]) shows typical fluorescence spectra in the 290-440 nm region covering the signals from the first negative band system of N + 2 (B 2 Σ + u -X 2 Σ + g transition) and the second positive band system of N 2 (C 3 Π u -B 3 Π g transition) [38,39] . It shows that the structures of the spectrum from molecular N 2 are similar in the three cases, but different at 391 and 428 nm, which are ionic lines from excited N + 2 through the transitions of…”

Section: Fluorescencementioning

confidence: 99%

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Spectroscopic analysis of high electric field enhanced ionization in laser filaments in air for corona guiding

Wei

Liu

Wang

et al. 2016

High Pow Laser Sci Eng

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We report on a systematic experimental study on the fluorescence spectra produced from a femtosecond laser filament in air under a high electric field. The electric field alone was strong enough to create corona discharge (CD). Fluorescence spectra from neutral and ionic air molecules were measured and compared with pure high-voltage CD and pure laser filamentation (FIL). Among them, high electric field assisted laser FIL produced nitrogen fluorescence more efficiently than either pure CD or pure FIL processes. The nonlinear enhancement of fluorescence from the interaction of the laser filament and corona discharging electric field resulted in a more efficient ionization along the laser filament zone, which was confirmed by the spectroscopic measurement of both ionization-induced fluorescence and plasma-scattered 800 nm laser pulses. This is believed to be the key precursor process for filament-guided discharge.

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The mechanism of nitrogen fluorescence inside a femtosecond laser filament in air

Cited by 139 publications

References 30 publications

Production of ozone and nitrogen oxides by laser filamentation

Production of ozone and nitrogen oxides by laser filamentation

Intense broadband THz generation from femtosecond laser filamentation

Spectroscopic analysis of high electric field enhanced ionization in laser filaments in air for corona guiding

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