Тип публикации: статья из журнала
Год издания: 2021
Идентификатор DOI: 10.1088/1367-2630/ac0198
Ключевые слова: uv pump-x-ray probe, molecular spectroscopy, ultrafast dynamics, potential energy surfaces, x-ray absorption, uv pump—x-ray probe
Аннотация: In theoretical simulations of a UV + x-ray pump-probe (UVX-PP) setup, we show that frequency detuning of the pump UV pulse acts as a camera shutter by regulating the duration of the UVX-PP process. This two-photon absorption with long overlapping UV and x-ray pulses, allowing for high spectral resolution, thereby provides informatiПоказать полностьюon about ultrafast dynamics of the nuclear wave packet without the requirement of ultrashort pulses and controlled delay times. In a case study of carbon monoxide, the calculated UVX-PP spectra of the O1s (-1)2 pi (1) and C1s (-1)2 pi (1) core-excited states show different vibrational profiles. The interference of intermediate vibrational states reveals details of nuclear dynamics in the UVX-PP process related to a variable duration time controlled by the UV detuning. Both O1s (-1)2 pi (1) and C1s (-1)2 pi (1) pump-probe channels display a splitting of the spectral profile, which however is associated with different physical mechanisms. At the O1s (-1)2 pi (1) resonance, the observed dispersive and non-dispersive spectral bands intersect and result in destructive interference.
Журнал: NEW JOURNAL OF PHYSICS
Выпуск журнала: Vol. 23, Is. 6
Номера страниц: 63030
ISSN журнала: 13672630
Место издания: BRISTOL
Издатель: IOP PUBLISHING LTD