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Titolo:
A new sub-Doppler fluorescence imaging method in studying laser ablation of B atoms at 248 nm
Autore:
Chang, JL; Chen, KM; Sung, CH; Chung, TH; Lee, KH; Chen, YT;
Indirizzi:
Inst Atom & Mol Sci, Taipei 106, Taiwan Inst Atom & Mol Sci Taipei Taiwan 106 Atom & Mol Sci, Taipei 106, Taiwan Natl Sun Yat Sen Univ, Dept Chem, Kaohsiung 80424, Taiwan Natl Sun Yat SenUniv Kaohsiung Taiwan 80424 em, Kaohsiung 80424, Taiwan Natl Taiwan Univ, Dept Chem, Taipei 106, Taiwan Natl Taiwan Univ Taipei Taiwan 106 n Univ, Dept Chem, Taipei 106, Taiwan
Titolo Testata:
JOURNAL OF PHYSICAL CHEMISTRY B
fascicolo: 22, volume: 105, anno: 2001,
pagine: 5079 - 5082
SICI:
1520-6106(20010607)105:22<5079:ANSFIM>2.0.ZU;2-#
Fonte:
ISI
Lingua:
ENG
Soggetto:
SHEET ILLUMINATION; PHOTOFRAGMENTS;
Tipo documento:
Letter
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
17
Recensione:
Indirizzi per estratti:
Indirizzo: Chang, JL Inst Atom & Mol Sci, POB 23-166, Taipei 106, Taiwan Inst Atom & Mol Sci POB 23-166 Taipei Taiwan 106 ei 106, Taiwan
Citazione:
J.L. Chang et al., "A new sub-Doppler fluorescence imaging method in studying laser ablation of B atoms at 248 nm", J PHYS CH B, 105(22), 2001, pp. 5079-5082

Abstract

A new sub-Doppler fluorescence imaging method has been applied to study the laser ablation of B atoms at 248 nm with a power density of similar to1.7x 10(8) W/cm(2). Two-dimensional velocity distributions of the laser ablated B(P-2 degrees (1/2,3/2)) atoms are measured. The angular distributions of the ablated B atoms are velocity-dependent. the higher the speed of the Batom is, the more centralized the distribution of the forward peaking willbe, indicating that the ablation plume undergoes an unsteady adiabatic expansion. The speed distributions of the B atoms are well fitted to the shifted Maxwellian functions and are found to be bimodal, including a fast component with a temperature of 1.8 x 10(4) K topping out at 5.8 eV and a slow component of 3.1 x 10(3) K reaching a maximum at 2.8 eV. While a plasma reaction is responsible for the fast component, the slow one results from photochemical processes.

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Documento generato il 04/04/20 alle ore 12:31:20