Improved production of Br atoms near zero speed by photodissociating laser aligned Br{sub 2} molecules
Abstract
We theoretically investigated the improvement on the production rate of the decelerated bromine (Br) atoms near zero speed by photodissociating laser aligned Br{sub 2} precursors. Adiabatic alignment of Br{sub 2} precursors exposed to long laser pulses with duration on the order of nanoseconds was investigated by solving the time-dependent Schrödinger equation. The dynamical fragmentation of adiabatically aligned Br{sub 2} precursors was simulated and velocity distribution of the Br atoms produced was analyzed. Our study shows that the larger the degree of the precursor alignment, 〈cos{sup 2} θ〉, the higher the production rate of the decelerated Br atoms near zero speed. For Br{sub 2} molecules with an initial rotational temperature of ∼1 K, a 〈cos{sup 2} θ〉 value of ∼0.88 can result in an improvement factor of over ∼20 on the production rate of the decelerated Br atoms near zero speed, requiring a laser intensity of only ∼1 × 10{sup 12} W/cm{sup 2} for alignment.
- Authors:
- State Key Laboratory of Precision Spectroscopy, Department of Physics, East China Normal University, Shanghai 200062 (China)
- Publication Date:
- OSTI Identifier:
- 22310755
- Resource Type:
- Journal Article
- Journal Name:
- Journal of Chemical Physics
- Additional Journal Information:
- Journal Volume: 141; Journal Issue: 16; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0021-9606
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 74 ATOMIC AND MOLECULAR PHYSICS; 37 INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY; ATOMS; BROMINE; LASERS; MOLECULES; PRECURSOR; PULSES; SCHROEDINGER EQUATION; TIME DEPENDENCE
Citation Formats
Deng, L. Z., E-mail: lzdeng@phy.ecnu.edu.cn, and Yin, J. P., E-mail: jpyin@phy.ecnu.edu.cn. Improved production of Br atoms near zero speed by photodissociating laser aligned Br{sub 2} molecules. United States: N. p., 2014.
Web. doi:10.1063/1.4898794.
Deng, L. Z., E-mail: lzdeng@phy.ecnu.edu.cn, & Yin, J. P., E-mail: jpyin@phy.ecnu.edu.cn. Improved production of Br atoms near zero speed by photodissociating laser aligned Br{sub 2} molecules. United States. https://doi.org/10.1063/1.4898794
Deng, L. Z., E-mail: lzdeng@phy.ecnu.edu.cn, and Yin, J. P., E-mail: jpyin@phy.ecnu.edu.cn. 2014.
"Improved production of Br atoms near zero speed by photodissociating laser aligned Br{sub 2} molecules". United States. https://doi.org/10.1063/1.4898794.
@article{osti_22310755,
title = {Improved production of Br atoms near zero speed by photodissociating laser aligned Br{sub 2} molecules},
author = {Deng, L. Z., E-mail: lzdeng@phy.ecnu.edu.cn and Yin, J. P., E-mail: jpyin@phy.ecnu.edu.cn},
abstractNote = {We theoretically investigated the improvement on the production rate of the decelerated bromine (Br) atoms near zero speed by photodissociating laser aligned Br{sub 2} precursors. Adiabatic alignment of Br{sub 2} precursors exposed to long laser pulses with duration on the order of nanoseconds was investigated by solving the time-dependent Schrödinger equation. The dynamical fragmentation of adiabatically aligned Br{sub 2} precursors was simulated and velocity distribution of the Br atoms produced was analyzed. Our study shows that the larger the degree of the precursor alignment, 〈cos{sup 2} θ〉, the higher the production rate of the decelerated Br atoms near zero speed. For Br{sub 2} molecules with an initial rotational temperature of ∼1 K, a 〈cos{sup 2} θ〉 value of ∼0.88 can result in an improvement factor of over ∼20 on the production rate of the decelerated Br atoms near zero speed, requiring a laser intensity of only ∼1 × 10{sup 12} W/cm{sup 2} for alignment.},
doi = {10.1063/1.4898794},
url = {https://www.osti.gov/biblio/22310755},
journal = {Journal of Chemical Physics},
issn = {0021-9606},
number = 16,
volume = 141,
place = {United States},
year = {Tue Oct 28 00:00:00 EDT 2014},
month = {Tue Oct 28 00:00:00 EDT 2014}
}