Dynamics of the high-intensity multiphoton ionization of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">N</mml:mi></mml:mrow><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math>

Gibson, George N.; Freeman, R. R.; McIlrath, T. J.

doi:10.1103/physrevlett.67.1230

Cited by 101 publications

(63 citation statements)

References 13 publications

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“…in subpicoseond time scale through releasing free electrons, forming air plasma filament. Optical field enhances free electron temperature, Te, to the order of 10 4 -10 5 K, while the temperature of neighboring molecules or ions, Tm, is much lower [18]. Within the following 10 −9 -10 −8 s, Tm rapidly ascents through energy transfer due to elastic and inelastic collision between hot electrons and the surrounding air molecules (nitrogen and oxygen), until thermal equilibrium appears [19,20].…”

Section: Experimental Details and Resultsmentioning

confidence: 99%

Acoustic Measurement of the Length of Air-plasma Filament Induced by an Intense Femtosecond Laser Pulse

Dai

Xiong

2017

ITM Web Conf.

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Abstract:The paper studies acoustic emission from air-plasma filament induced by a strong femtosecond laser pulse. Acoustic signal is detected with a sensitive directional microphone. Acoustic measurement provides a new method to determine the length of a filament. Compared with other methods, acoustic measurement is simpler, more sensitive, and with higher spatial resolution. Information of filament length is experimentally acquired through measuring acoustic pressure at different position of filament. On the basis of the relationship between acoustic signal and free-electron density in filament, profile of free-electron density is demonstrated

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Section: Experimental Details and Resultsmentioning

confidence: 99%

Acoustic Measurement of the Length of Air-plasma Filament Induced by an Intense Femtosecond Laser Pulse

Dai

Xiong

2017

ITM Web Conf.

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“…It can be clearly seen from the figure that with the increase of the initial energy of the laser pulse E in , the onset of filaments moves towards the focus of the lens and the fluorescence intensity increases significantly. In addition, the filament length also [23][24][25][26] . In the transitions v-v , v and v denote the vibrational levels of upper and lower electronic states, respectively.…”

Section: Resultsmentioning

confidence: 99%

Nitrogen fluorescence induced by the femtosecond intense laser pulses in air

et al. 2016

High Pow Laser Sci Eng

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Our experiments show that external focusing and initial laser energy strongly influences filament generated by the femtosecond Ti-sapphire laser in air. The experimental measurements show the filament length can be extended both by increasing the laser energy and focal length of focusing lens. On the other hand, the plasma fluorescence emission can be enhanced by increasing the laser energy with fixed focal length or decreasing the focal length. In addition, the collapse distance measured experimentally are larger than the calculated ones owing to the group-velocity-dispersion effect. In addition, we find that the line widths of the spectral lines from N 2 is independent of filament positions, laser energies and external focusing.

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“…Earlier experimental studies [6][7][8] suggested that ionization rates of molecules are similar to noble gas atoms with similar IP, although more recent experiments have found exceptions [9][10][11][12]. The ionization is suppressed for O 2 , in comparison with Xe, while the ionization of N 2 and F 2 are comparable to their comparison atom Ar.…”

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confidence: 85%

Role of the electronic structure and multielectron responses in ionization mechanisms of diatomic molecules in intense short-pulse lasers: An all-electronab initiostudy

Chu

2004

Phys. Rev. A

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We present an all-electron ab initio study of multiphoton ionization (MPI) of diatomic molecules in intense laser pulses using the example of N 2 , O 2 , and F 2 , and the theoretical approach of time-dependent densityfunctional theory with correct long-range potential. The results reveal the importance of the electronic structure and correlated multielectron responses in the ionization mechanism, and make evident inner valence electron contributions to the molecular MPI in strong laser fields. The single electron ionization of molecules in ultrashort intense laser fields is a key process leading to a number of strong-field phenomena, such as above-threshold ionization, multiphoton ionization and dissociation, high harmonic generation, Coulomb explosion, nonsequential multielectron ionization, etc. Thus a detailed understanding of the ionization mechanism is a prerequisite for the exploration of molecular physics in strong fields.The strong-field ionization of rare-gas atoms has been well studied by solving time-dependent Schrödinger equations with the single active electron (SAE) approximation [1][2][3]. In the tunneling regime [4], the Ammosov-DeloneKrainov (ADK) model [5] (based on SAE and other approximations) has also been used to study the single and sequential multielectron ionization of rare-gas atoms. In the ADK model, the response of an atom depends only upon the ionization potential (IP) of the outermost atomic orbital, and details of the electronic structure are not considered.Multiphoton ionization of molecules, however, is considerably more complicated and the understanding of its mechanisms remains unsettled. Earlier experimental studies [6][7][8] suggested that ionization rates of molecules are similar to noble gas atoms with similar IP, although more recent experiments have found exceptions [9][10][11][12]. The ionization is suppressed for O 2 , in comparison with Xe, while the ionization of N 2 and F 2 are comparable to their comparison atom Ar. Without an ab initio study of time-dependent dynamics of many-electron molecules, recent theoretical studies of molecular ionization behavior have relied upon approximate models such as the ADK [15] predicts that the interference between electrons emitted from the vicinity of two distinct ionic centers can lead to ionization suppression for molecules with antisymmetric electronic ground states. All three models correctly predict the suppressed ionization of O 2 , and the absence of suppression of N 2 . However, the ADK and KFR models also predict the ionization suppression of F 2 [13,15], which is in disagreement with recent experimental results [9][10][11][12].

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Dynamics of the high-intensity multiphoton ionization ofN2

Cited by 101 publications

References 13 publications

Acoustic Measurement of the Length of Air-plasma Filament Induced by an Intense Femtosecond Laser Pulse

Acoustic Measurement of the Length of Air-plasma Filament Induced by an Intense Femtosecond Laser Pulse

Nitrogen fluorescence induced by the femtosecond intense laser pulses in air

Role of the electronic structure and multielectron responses in ionization mechanisms of diatomic molecules in intense short-pulse lasers: An all-electronab initiostudy

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