dorsal/arxiv
View SchemaHigh-Order Harmonic Generation in Laser-Irradiated Homonuclear Diatomics: The Velocity Gauge Version of Molecular Strong-Field Approximation
| Authors | Vladimir I. Usachenko, Pavel E. Pyak, Shih-I Chu |
|---|---|
| Categories | |
| ArXiv ID | physics/0604071 |
| URL | https://arxiv.org/abs/physics/0604071 |
| DOI | 10.1134/S1054660X06090076 |
Abstract
The generation of high harmonics in laser-irradiated light homonuclear diatomics (H2+, N2 and O2) compared to that in atomic counterparts (of nearly identical binding energy) is studied within the velocity gauge version of conventional strong-field approximation. The applied strong-field approach (we alternatively developed earlier to incorporate rescattering effects beyond the conventional saddle-point approximation) is currently extended to molecular case by means of supplement the standard linear combination of atomic orbitals} and molecular orbitals method. The associated model proved to adequately reproduce a general shape and detailed structure of molecular harmonic spectra, which demonstrate a number of remarkable distinctive differences from respective atomic spectra calculated under the same laser pulses. The revealed differences are found to be strongly dependent on internuclear separation and also very sensitive to the orbital and bonding symmetry of contributing molecular valence shell. In particular, the model correctly predicts the behavior of high-frequency plateau (both for its extent and even details of structure) in molecular harmonic spectra at small (nearly equilibrium) and large internuclear separations. In addition, for some group of harmonics, the harmonic emission rates were ascertained to dominate by contribution from inner molecular shells of higher binding energy and different orbital symmetry compared to the outermost molecular orbital normally predominantly contributing.
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"abstract": "The generation of high harmonics in laser-irradiated light homonuclear\ndiatomics (H2+, N2 and O2) compared to that in atomic counterparts (of nearly\nidentical binding energy) is studied within the velocity gauge version of\nconventional strong-field approximation. The applied strong-field approach (we\nalternatively developed earlier to incorporate rescattering effects beyond the\nconventional saddle-point approximation) is currently extended to molecular\ncase by means of supplement the standard linear combination of atomic orbitals}\nand molecular orbitals method. The associated model proved to adequately\nreproduce a general shape and detailed structure of molecular harmonic spectra,\nwhich demonstrate a number of remarkable distinctive differences from\nrespective atomic spectra calculated under the same laser pulses. The revealed\ndifferences are found to be strongly dependent on internuclear separation and\nalso very sensitive to the orbital and bonding symmetry of contributing\nmolecular valence shell. In particular, the model correctly predicts the\nbehavior of high-frequency plateau (both for its extent and even details of\nstructure) in molecular harmonic spectra at small (nearly equilibrium) and\nlarge internuclear separations. In addition, for some group of harmonics, the\nharmonic emission rates were ascertained to dominate by contribution from inner\nmolecular shells of higher binding energy and different orbital symmetry\ncompared to the outermost molecular orbital normally predominantly\ncontributing.",
"arxiv_id": "physics/0604071",
"authors": [
"Vladimir I. Usachenko",
"Pavel E. Pyak",
"Shih-I Chu"
],
"categories": [
"physics.atom-ph",
"physics.chem-ph"
],
"doi": "10.1134/S1054660X06090076",
"title": "High-Order Harmonic Generation in Laser-Irradiated Homonuclear Diatomics: The Velocity Gauge Version of Molecular Strong-Field Approximation",
"url": "https://arxiv.org/abs/physics/0604071"
},
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