Photodetachment threshold shift in a strong laser field

Trainham, R.; Fletcher, G. D.; Mansour, N. B.; Larson, D. J.

doi:10.1103/physrevlett.59.2291

Cited by 72 publications

(17 citation statements)

References 34 publications

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“…However, our results are inconsistent with an observation [1] of an anomalously low shift in the threshold frequency for photodetachment of Cl by a HF field in the presence of a LF field with PI, /h~L, of the order of 10; the observed shift in the threshold energy was only about one quarter of Pp.…”

Section: Resultscontrasting

confidence: 99%

“…and 0 &~o+&H && -PI. A recent measurement [1] of the threshold energy for photodetachment of Cl by a weak high-frequency (HF) field in the presence of a low-frequency (LF) field has raised an interesting question: What role is played by the ponderomotive energy due to the LF field in two-color photodetachment processes' This question has been answered to some extent by Bloomfield [2], who, through numerical integration of the time-dependent Schrodinger equation for a model one-dimensional ion in the presence of a short HF pulse and a continuous LF field, demonstrated the similarity of the LF field to a dc field. The results of the present paper complement, and supplement, those of Bloomfield; we formulate our treatment within a time-independent framework, and within three dimensions (we may thereby allow the fields to have arbitrary polarizations), we give a fairly detailed mathematical analysis, and we elucidate the differences between a low-frequency field and a true dc field.…”

Section: Introductionmentioning

confidence: 99%

“…In regime (1), the LF field is so weak that the probability for absorption of a LF photon is small. Q'e may therefore set n = 0, and since the right-hand side of Eq.…”

Section: Introductionmentioning

confidence: 99%

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Role of the ponderomotive energy in two-color photodetachment of an ion

1992

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We study, within a time-independent framework, the photodetachment of an ion by a weak highfrequency field in the presence of a field of low frequency al. . We explore the role played by the ponderomotive energy Prdue . to the low-frequency (LF) field. If Pi~hurt" the threshold energy for photodetachment by the high-frequency field is increased by the amount Pl. , while if PI.~hu& the threshold energy is decrea8ed, due to tunneling through the barrier formed by the atomic potential and the LF field. If P& & h~& the low-frequency field behaves like a dc field, but the strong repulsive barrier has a characteristic height of 2PI" in contrast to the case of a true dc field (where the height is infinite). If the kinetic energy of the outgoing photoelectron is smaller than or comparable to 2PI. , the photodetachment probability is sensitive to the polarization of the low-frequency field, and exhibits ripples as the high frequency varies. These ripples are due to the interference of the direct photoelectron wave and the wave that reflects from the repulsive barrier. The differences between the low-frequency field and a true dc field are elucidated.PACS number(s): 32.90.+a

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Section: Resultscontrasting

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Role of the ponderomotive energy in two-color photodetachment of an ion

1992

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“…In what follows the corresponding photons will be referred to as uv photons. The other field, considerably more intense, of frequency co2 lying in the infrared [3], is designed to determine the shift of the field-free threshold of the process. The expected shift is equal to the ponderomotive one b2=e E /4m' with e and m, respectively, the absolute value of the electron charge and mass.…”

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Field-assisted photodetachment process to observe the ponderomotive shift

et al. 1994

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“…[11], where calculations of the ionization cross-sections have been performed by assuming that the two radiation fields were coherent, and in the experimental study of ref. [3][4][5][6][7].…”

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Simultaneous multiphoton ionization by two radiation fields. Effects of the statistical properties of the radiation

1991

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Summary.--We report on calculations of differential and total ionization crosssections of hydrogen atoms irradiated by two radiation fields with different properties. One of the fields is of low intensity and relatively high frequency, the other is of low frequency and high intensity. In particular, we show that the inclusion of the multimode structure of the low-frequency laser field modifies considerably the shape of the angular distribution of the photoelectrons and the rates of ionization into the different channels characterized by the number of low-frequency photons exchanged. Further, we find that the average energy exchanged between the photoelectrons and the low-frequency radiation field is independent of the statistical properties of the low-frequency laser field.PACS 32.80 -Photon interactions with atoms.

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Photodetachment threshold shift in a strong laser field

Abstract: A shift in a continuum threshold due to the presence of a strong laser field has been directly observed. An increase in the photodetachment threshold of CI ~ was observed in the presence of 1064-nmwavelength radiation.

Cited by 72 publications

References 34 publications

Role of the ponderomotive energy in two-color photodetachment of an ion

Role of the ponderomotive energy in two-color photodetachment of an ion

Field-assisted photodetachment process to observe the ponderomotive shift

Simultaneous multiphoton ionization by two radiation fields. Effects of the statistical properties of the radiation

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