dorsal/arxiv
View SchemaCorrelation dynamics between electrons and ions in the fragmentation of D$_2$ molecules by short laser pulses
| Authors | X. M. Tong, Z. X. Zhao, C. D. Lin |
|---|---|
| Categories | |
| ArXiv ID | physics/0307084 |
| URL | https://arxiv.org/abs/physics/0307084 |
| DOI | 10.1103/PhysRevA.68.043412 |
Abstract
We studied the recollision dynamics between the electrons and D$_2^+$ ions following the tunneling ionization of D$_2$ molecules in an intense short pulse laser field. The returning electron collisionally excites the D$_2^+$ ion to excited electronic states from there D$_2^+$ can dissociate or be further ionized by the laser field, resulting in D$^+$ + D or D$^+$ + D$^+$, respectively. We modeled the fragmentation dynamics and calculated the resulting kinetic energy spectrum of D$^+$ to compare with recent experiments. Since the recollision time is locked to the tunneling ionization time which occurs only within fraction of an optical cycle, the peaks in the D$^+$ kinetic energy spectra provides a measure of the time when the recollision occurs. This collision dynamics forms the basis of the molecular clock where the clock can be read with attosecond precision, as first proposed by Corkum and coworkers. By analyzing each of the elementary processes leading to the fragmentation quantitatively, we identified how the molecular clock is to be read from the measured kinetic energy spectra of D$^+$ and what laser parameters be used in order to measure the clock more accurately.
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"abstract": "We studied the recollision dynamics between the electrons and D$_2^+$ ions\nfollowing the tunneling ionization of D$_2$ molecules in an intense short pulse\nlaser field. The returning electron collisionally excites the D$_2^+$ ion to\nexcited electronic states from there D$_2^+$ can dissociate or be further\nionized by the laser field, resulting in D$^+$ + D or D$^+$ + D$^+$,\nrespectively. We modeled the fragmentation dynamics and calculated the\nresulting kinetic energy spectrum of D$^+$ to compare with recent experiments.\nSince the recollision time is locked to the tunneling ionization time which\noccurs only within fraction of an optical cycle, the peaks in the D$^+$ kinetic\nenergy spectra provides a measure of the time when the recollision occurs. This\ncollision dynamics forms the basis of the molecular clock where the clock can\nbe read with attosecond precision, as first proposed by Corkum and coworkers.\nBy analyzing each of the elementary processes leading to the fragmentation\nquantitatively, we identified how the molecular clock is to be read from the\nmeasured kinetic energy spectra of D$^+$ and what laser parameters be used in\norder to measure the clock more accurately.",
"arxiv_id": "physics/0307084",
"authors": [
"X. M. Tong",
"Z. X. Zhao",
"C. D. Lin"
],
"categories": [
"physics.atom-ph"
],
"doi": "10.1103/PhysRevA.68.043412",
"title": "Correlation dynamics between electrons and ions in the fragmentation of D$_2$ molecules by short laser pulses",
"url": "https://arxiv.org/abs/physics/0307084"
},
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