Intense-field dissociation dynamics of D2+ molecular ions using ultrafast laser pulses

Tomas Bryan; S.L. Stebbings; R E English; I.C.E. Turcu; John Collier; Jim McCann; Ian Williams

doi:10.1088/0953-4075/40/13/007

Intense-field dissociation dynamics of D2+ molecular ions using ultrafast laser pulses

Tomas Bryan, S.L. Stebbings, R E English, I.C.E. Turcu, John Collier, Jim McCann, Ian Williams

Research output: Contribution to journal › Article › peer-review

11 Citations (Scopus)

Abstract

The dynamics of dissociation of pre-ionized D2+ molecules using intense (10^12–10^15 W cm-2), ultrashort (50 fs), infrared (? = 790 nm) laser pulses are examined. Use of an intensity selective scan technique has allowed the deuterium energy spectrum to be measured over a broad range of intensity. It is found that the dominant emission shifts to lower energies as intensity is increased, in good agreement with corresponding wavepacket simulations. The results are consistent with an interpretation in terms of bond softening, which at high intensity (approximately >3 × 10^14 W cm-2) becomes dominated by dissociative ionization. Angular distribution measurements reveal the presence of slow molecular dissociation, an indication that vibrational trapping mechanisms occur in this molecule.

Original language	English
Article number	007
Pages (from-to)	2607-2619
Number of pages	13
Journal	Journal of Physics B: Atomic Molecular and Optical Physics
Volume	40
Issue number	13
DOIs	https://doi.org/10.1088/0953-4075/40/13/007
Publication status	Published - 14 Jul 2007

ASJC Scopus subject areas

Atomic and Molecular Physics, and Optics
Physics and Astronomy(all)

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10.1088/0953-4075/40/13/007

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title = "Intense-field dissociation dynamics of D2+ molecular ions using ultrafast laser pulses",

abstract = "The dynamics of dissociation of pre-ionized D2+ molecules using intense (10^12–10^15 W cm-2), ultrashort (50 fs), infrared (? = 790 nm) laser pulses are examined. Use of an intensity selective scan technique has allowed the deuterium energy spectrum to be measured over a broad range of intensity. It is found that the dominant emission shifts to lower energies as intensity is increased, in good agreement with corresponding wavepacket simulations. The results are consistent with an interpretation in terms of bond softening, which at high intensity (approximately >3 × 10^14 W cm-2) becomes dominated by dissociative ionization. Angular distribution measurements reveal the presence of slow molecular dissociation, an indication that vibrational trapping mechanisms occur in this molecule.",

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Intense-field dissociation dynamics of D2+ molecular ions using ultrafast laser pulses. / Bryan, Tomas; Stebbings, S.L.; English, R E; Turcu, I.C.E.; Collier, John; McCann, Jim; Williams, Ian.

In: Journal of Physics B: Atomic Molecular and Optical Physics, Vol. 40, No. 13, 007, 14.07.2007, p. 2607-2619.

Research output: Contribution to journal › Article › peer-review

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AU - McCann, Jim

AU - Williams, Ian

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AB - The dynamics of dissociation of pre-ionized D2+ molecules using intense (10^12–10^15 W cm-2), ultrashort (50 fs), infrared (? = 790 nm) laser pulses are examined. Use of an intensity selective scan technique has allowed the deuterium energy spectrum to be measured over a broad range of intensity. It is found that the dominant emission shifts to lower energies as intensity is increased, in good agreement with corresponding wavepacket simulations. The results are consistent with an interpretation in terms of bond softening, which at high intensity (approximately >3 × 10^14 W cm-2) becomes dominated by dissociative ionization. Angular distribution measurements reveal the presence of slow molecular dissociation, an indication that vibrational trapping mechanisms occur in this molecule.

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