Cross sections for quenching of Pb 6p7s3P1 atoms by collisions with CH4, CO, and CO2 molecules

Pb vapor mixed with a buffer gas was irradiated with pulses of laser light so as to populate the [Formula: see text] state, whose radiative and collisional decay was monitored by the method of time-resolved fluorescence spectroscopy. The variation of the measured decay constants with buffer-gas pressures yielded the total depopulation (quenching) cross sections Q = 3.32 ± 0.25, 25.6 ± 2.2, and 84.1 ± 8.4 Å2 for collisions with CH4, CO, and CO2, respectively.

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A study of radiative and collisional decay of Pb atoms by time-resolved laser spectroscopy

Canadian Journal of Physics ◽

10.1139/p84-207 ◽

1984 ◽

Vol 62 (12) ◽

pp. 1616-1621 ◽

Cited By ~ 9

Author(s):

D. H. Giers ◽

J. B. Atkinson ◽

L. Krause

Keyword(s):

Cross Sections ◽

Decay Constant ◽

Radiative Lifetime ◽

Resonance Wavelength ◽

Nitrogen Laser ◽

Buffer Gas ◽

Time Resolved ◽

Upper Limit ◽

Least Squares Fit ◽

Gas Pressures

The 6p7s[Formula: see text] state of atomic Pb was populated by irradiation of Pb vapor by the frequency-doubled output of a pulsed nitrogen laser–pumped dye laser at the resonance wavelength λ = 2833 Å, and the resulting fluorescent decay was monitored using the method of delayed coincidences. A least squares fit to the observed time-decay spectrum yielded the decay constant and gave the radiative lifetime of the [Formula: see text] state, τ = 5.85 ± 0.20 ns. The dependence of the decay constant on buffer gas pressures was also investigated, yielding the total depopulation (quenching) cross sections Q = 0.31 ± 0.10 Å2 and 12.2 ± 1.0 Å2 for collisions with H2 and N2, respectively. An upper limit (Q < 0.2 Å2) for the He quenching cross section was also determined.

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Investigating the Metal-enhanced Fluorescence on Fluorescein by Silica Core-Shell Gold Nanoparticles using Time-Resolved Fluorescence Spectroscopy

Dyes and Pigments ◽

10.1016/j.dyepig.2021.109263 ◽

2021 ◽

pp. 109263

Author(s):

Yi-Ting Liu ◽

Xue-Feng Luo ◽

Yin-Yu Lee ◽

I-Chia Chen

Keyword(s):

Gold Nanoparticles ◽

Fluorescence Spectroscopy ◽

Core Shell ◽

Time Resolved Fluorescence ◽

Enhanced Fluorescence ◽

Metal Enhanced Fluorescence ◽

Time Resolved ◽

Silica Core

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Time-resolved fluorescence spectroscopy. Applications to calmodulin

Journal of Biological Chemistry ◽

10.1016/s0021-9258(18)98969-6 ◽

1991 ◽

Vol 266 (18) ◽

pp. 11405-11408

Author(s):

S.R. Anderson

Keyword(s):

Fluorescence Spectroscopy ◽

Time Resolved Fluorescence ◽

Time Resolved

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Disorientation of Cs(62P1/2) atoms, induced in collisions with noble gases

Canadian Journal of Physics ◽

10.1139/p76-085 ◽

1976 ◽

Vol 54 (7) ◽

pp. 748-752 ◽

Cited By ~ 4

Author(s):

B. Niewitecka ◽

L. Krause

Keyword(s):

Cross Sections ◽

Noble Gas ◽

Zero Magnetic Field ◽

Zero Field ◽

Buffer Gas ◽

Resonance Fluorescence ◽

Circularly Polarized ◽

Low Field ◽

Good Agreement ◽

Gas Pressures

The disorientation of 62P1/2 cesium atoms, induced in collisions with noble gas atoms in their ground states, was systematically investigated by monitoring the depolarization of cesium resonance fluorescence in relation to noble gas pressures. The Cs atoms, contained together with a buffer gas in a fluorescence cell and located in zero magnetic field, were excited and oriented by irradiation with circularly polarized 8943 Å resonance radiation, and the resonance fluorescence, emitted in an approximately backward direction, was analyzed with respect to circular polarization. The experiments yielded the following disorientation cross sections which have been corrected for the effects of nuclear spin: Cs–He: 4.9 ± 0.7 Å2; Cs–Ne: 2.1 ± 0.3 Å2; Cs–Ar: 5.6 ± 0.8 Å2; Cs–Kr: 5.8 ± 0.9 Å2; Cs–Xe: 6.3 ± 0.9 Å2. The results are in good agreement with most of the available zero-field and low-field data.

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