Multiphoton Processes in Heteropolar Diatomic Molecules

Bunkin, F. V.; Tugov, I. I.

doi:10.1103/physreva.8.620

Cited by 12 publications

(3 citation statements)

References 5 publications

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“…It helps to develop a quantitative theory of multi-photon laser-molecule interactions within perturbative picture [2]. The attractive effective electronic terms in both diabatic and adiabatic limits can be approximated by the Morse potential, including rotation corrections [23]:…”

Section: Approximation Of Morse Potentialmentioning

confidence: 99%

“…In resonant CW laser fields of weak intensity I ( 10 8 W/cm 2 , the laser-induced contribution to molecular spectra can be calculated by means of a perturbation theory [2,3]. If the laser field is strong enough like 10 10 W/cm 2 ( I ( 10 14 W/cm 2 , then the laser-induced nonadiabatic spectra can be calculated within an adiabatic perturbation theory [4].…”

Section: Introductionmentioning

confidence: 99%

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Light-induced molecular potentials and temperature-dependent polarization of molecular vapours in intense resonant laser fields: I. Nonperturbative theory in quasi-classical approximation

Pegarkov

2006

Chemical Physics

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Section: Approximation Of Morse Potentialmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Light-induced molecular potentials and temperature-dependent polarization of molecular vapours in intense resonant laser fields: I. Nonperturbative theory in quasi-classical approximation

Pegarkov

2006

Chemical Physics

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“…A stable, modified vacuum state has only been obtained when the field fills a finite spacetime domain [18]. The perturbative vacuum is also stable for an ideal plane wave (laser) field of arbitrary strength, and thus many investigations have focused on understanding pair production in optimized pulsed laser field configurations [22,23,24,25,26,27,28,29,30,31,32]. More recently it has been also noted that in the interaction of laser pulses with thin foils, the charge seperation effect due to a much greater electron mobility helps in achieving longitudinal electrical fields of comparable strength as are present in the laser pulse, a phenomenon used in laser-ion acceleration [33].…”

mentioning

confidence: 99%

Vacuum-decay time in strong external fields

Labun

Rafelski

2009

Phys. Rev. D

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We consider dynamics of vacuum decay and particle production in the context of short pulse laser experiments. We identify and evaluate the invariant "materialization time," τ , the timescale for the conversion of an electromagnetic field energy into particles, and we compare to the laser related time scales.In the past decade high intensity short pulse laser technology has advanced rapidly [1], pulses achieved intensities of 10 26 W/m 2 [2,3]. With subsequent concentration by coherent harmonic focusing allowing a further gain in intensity of around six orders of magnitude [4], laser technology is nearing the scale of rapid vacuum instability, cǫ 0 E 2 0 /4π = 4.65×10 33 W/m 2 , where E 0 ≡ m 2 c 3 /e = 1.32 × 10 18 V/m. The study of vacuum instability with laser pulses involves dynamics on a timescale set by the pulse length, which at optical frequencies implies that the fields are in existence for ∼ 10 −15 s, and may reach ∼ 10 −18 s when coherent harmonic focusing is used.The vacuum state of quantum electrodynamics (QED) is metastable in the presence of electrical fields of any strength, but only in proximity of E 0 does the effect occur on an observable time scale [5,6], as we exhibit below. Specifically, we investigate whether the laser pulse timescale allows the vacuum in strong fields to relax, thereby admitting the new vacuum to experimental investigation using pulsed lasers. The dynamics of 'false' vacuum decay have been studied in the context of spontaneous positron creation in heavy ion collisions [7,8,9] and cosmological models [10,11,12]. The QED vacuum decay has not been directly observed in heavy ion collision experiments, due to the relatively long time scale of vacuum decay dynamics as compared to competing processes. However, particle production in strong fields has found a fertile field in quantum chromodynamics [13,14].Considerable effort went into generalizing the Euler-Heisenberg-Schwinger (EHS) [5,6] pair production mechanism for a variety of large-scale (compared toλ e = /m e c = 3.86 × 10 −13 m) space-and time-dependent field configurations [15,16,17] and to incorporating back reaction [13,18,19,20,21]. A stable, modified vacuum state has only been obtained when the field fills a finite spacetime domain [18]. The perturbative vacuum is also stable for an ideal plane wave (laser) field of arbitrary strength, and thus many investigations have focused on understanding pair production in optimized pulsed laser field configurations [22,23,24,25,26,27,28,29,30,31,32]. More recently it has been also noted that in the interaction of laser pulses with thin foils, the charge seperation effect due to a much greater electron mobility helps in achieving longitudinal electrical fields of comparable strength as are present in the laser pulse, a phenomenon used in laser-ion acceleration [33]. We thus address in this work the general circumstance of a spatially homogeneous electrical field.In all laboratory experiments supercritical fields (fields capable of spontaneous particle production) will be strongl...

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Vibrational green's function and two-photon dissociation for diatomic molecules

Lami¹,

Rahman²

1979

Chemical Physics Letters

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Multiphoton Processes in Heteropolar Diatomic Molecules

Cited by 12 publications

References 5 publications

Light-induced molecular potentials and temperature-dependent polarization of molecular vapours in intense resonant laser fields: I. Nonperturbative theory in quasi-classical approximation

Light-induced molecular potentials and temperature-dependent polarization of molecular vapours in intense resonant laser fields: I. Nonperturbative theory in quasi-classical approximation

Vacuum-decay time in strong external fields

Vibrational green's function and two-photon dissociation for diatomic molecules

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