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Title: 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:
;  [1]
  1. 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}
}