Multiphoton Ionization of Hydrogen and Rare-Gas Atoms

Bebb, H. Barry; Gold, Albert

doi:10.1103/physrev.143.1

Cited by 432 publications

(95 citation statements)

References 36 publications

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“…It has been established [3][4][5][6][7][8][9][10][11] that the threshold photon flux density or equivalently the threshold power density for MPI varies with P −1/n , where P is the gas pressure and n is the number of simultaneously absorbed photons. Therefore, MPI predicts a very weak dependence of the threshold power density on pressure.…”

Section: Optical Breakdown Threshold Intensities For Omentioning

confidence: 99%

“…Measurements of the emission spectra revealed a highly ionized plasma which expanded somewhat like a blast wave into the surrounding medium. Since the first observations of LIB in gases [2], the phenomenon has been studied extensively, both theoretically and experimentally [3][4][5][6][7][8][9][10][11]. Among the various diagnostic techniques which are convenient tools for detecting various transient species from UV up to IR spectral regions, optical emission spectroscopy (OES) has definite advantages pertaining to high spatial and temporal resolution without perturbation of the laser-induced plasma.…”

Section: Introductionmentioning

confidence: 99%

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Optical emission spectroscopy of oxygen plasma induced by IR CO₂pulsed laser

Camacho

Santos

Díaz

et al. 2008

J. Phys. D: Appl. Phys.

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Laser-induced breakdown (LIB) spectroscopy in oxygen at room temperature and pressures ranging from 4.6 to 75 kPa was studied using a high-power transverse excitation atmospheric CO 2 laser (λ = 9.621 and 10.591 µm; τ FWHM = 64 ns; power densities ranging from 0.87 to 6.31 GW cm −2 ). The spectrum of the generated plasma is dominated by emission of strong O, O + and weak O 2+ atomic lines. Excitation temperatures of 31 500 ± 1600 K and 23 000 ± 3000 K were estimated by means of O 2+ and O + ionic lines, respectively. Electron number densities of the order of (3.5-16.5) × 10 16 cm −3 were deduced from the Stark broadening of several ionic O + lines. The characteristics of the spectral emission intensities from different species have been investigated as functions of the oxygen pressure and laser irradiance. Optical breakdown threshold intensities in O 2 at 10.591 µm have been determined. The physical processes leading to LIB of oxygen have been analysed.

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Section: Optical Breakdown Threshold Intensities For Omentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Optical emission spectroscopy of oxygen plasma induced by IR CO₂pulsed laser

Camacho

Santos

Díaz

et al. 2008

J. Phys. D: Appl. Phys.

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“…Bebb and Gold [60][61][62] concluded that although multiphoton ionization may supply the initial electrons, it does not account entirely for the breakdown phenomenon, except possibly at very low pressures when the formation of an electron cascade is inhibited. Moreover, it has been established [60][61][62] that the threshold photon flux density F th or, equivalently, the threshold power density J th for multiphoton ionization varies with P −1/n , where P is the gas pressure and n is the number of simultaneously absorbed photons. Therefore, multiphoton ionization predicts a very weak dependence of J th on P for trisilane.…”

Section: F Laser-induced Breakdown Mechanism In Trisilanementioning

confidence: 99%

Laser-induced breakdown spectroscopy of trisilane using infrared CO2 laser pulses

Camacho

Poyato

Díaz

et al. 2007

Journal of Applied Physics

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Synthesis and photoluminescence of fluorinated graphene quantum dots Appl. Phys. Lett. 102, 013111 (2013) The luminescence characteristics of CsI(Na) crystal under α and X/γ excitation J. Appl. Phys. 113, 023101 (2013) Structural and optoelectronic properties of Eu2+-doped nanoscale barium titanates of pseudo-cubic form J. Appl. Phys. 112, 124321 (2012) Quantum yield of luminescence of Ag nanoclusters dispersed within transparent bulk glass vs. glass composition and temperature Appl. Phys. Lett. 101, 251106 (2012) Additional information on J. Appl. Phys. The plasma produced in trisilane ͑Si 3 H 8 ͒ at room temperature and pressures ranging from 50 to 10 3 Pa by laser-induced breakdown ͑LIB͒ has been investigated. The ultraviolet-visible-near infrared emission generated by high-power IR CO 2 laser pulses in Si 3 H 8 has been studied by means of optical emission spectroscopy. Optical breakdown threshold intensities in trisilane at 10.591 m for laser pulse lengths of 100 ns have been measured as a function of gas pressure. The strong emission observed in the plasma region is mainly due to electronic relaxation of excited atomic H and Si and ionic fragments Si + , Si 2+ , and Si 3+ . An excitation temperature T exc = 5600± 300 K was calculated by means of H atomic lines assuming local thermodynamic equilibrium. The physical processes leading to LIB of trisilane in the power density range 0.28 GW cm −2 Ͻ J Ͻ 3.99 GW cm −2 have been analyzed. From our experimental observations we can propose that, although the first electrons must appear via multiphoton ionization, electron cascade is the main mechanism responsible for the breakdown in trisilane.

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“…primarily with the phenomenon of laser-induced gas breakdown (Bebb andGold 1966, Morton 1967). For the treatment of processes associated with very high light intensities, the perturbation treatment of the interaction between the atomic system and the radiation field is not valid; and other more suitable methods have been proposed (Reiss 1970, Faisal 1972.…”

Section: Some Investigations Of Multiphoton Ionization Have Been Concmentioning

confidence: 99%

Polarization phenomena in multiphoton ionization of atoms

Jacobs

1973

J. Phys. B: At. Mol. Phys.

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Multiphoton Ionization of Hydrogen and Rare-Gas Atoms

Cited by 432 publications

References 36 publications

Optical emission spectroscopy of oxygen plasma induced by IR CO₂pulsed laser

Optical emission spectroscopy of oxygen plasma induced by IR CO₂pulsed laser

Laser-induced breakdown spectroscopy of trisilane using infrared CO2 laser pulses

Polarization phenomena in multiphoton ionization of atoms

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Multiphoton Ionization of Hydrogen and Rare-Gas Atoms

Cited by 432 publications

References 36 publications

Optical emission spectroscopy of oxygen plasma induced by IR CO2pulsed laser

Optical emission spectroscopy of oxygen plasma induced by IR CO2pulsed laser

Laser-induced breakdown spectroscopy of trisilane using infrared CO2 laser pulses

Polarization phenomena in multiphoton ionization of atoms

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Product

Resources

About

Optical emission spectroscopy of oxygen plasma induced by IR CO₂pulsed laser

Optical emission spectroscopy of oxygen plasma induced by IR CO₂pulsed laser