Time resolved study of the uv and near uv continuums of xenon

Millet, P.; Birot, A.; Brunet, H.; Galy, Jean; Pons‐Germain, B.; Teyssier, J.L.

doi:10.1063/1.436349

Cited by 96 publications

(37 citation statements)

References 20 publications

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“…As can be understood from (3), the relative variation of with respect to 0018-9499/02$17.00 © 2002 IEEE must be measured accurately for estimating . Although luminescence spectra of rare gases have been measured by many researchers (e.g., [4]- [6]), they were not corrected for the efficiency of monochromator and detectors.…”

Section: Principlementioning

confidence: 99%

Absolute number of scintillation photons emitted by alpha particles in rare gases

Saito

Tawara

Sanami

et al. 2002

IEEE Trans. Nucl. Sci.

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To determine absolute scintillation yields due to alpha particles in high-pressure rare gases, the number of scintillation photons was measured using a vacuum ultraviolet (VUV) sensitive photodiode with spectral quantum efficiency ( ) measured as a function of wavelength . The absolute number of photoelectrons from the photocathode pe was measured using a charge-sensitive preamplifier calibrated with respect to charge number. The collection efficiency for scintillation photons ce at the photocathode was determined from the solid angle subtended by the photocathode at a scintillation point under the condition that there are no photons reflected off the surrounding walls. was determined from = pe ( ce ), where is the average quantum efficiency calculated from ( ) and a relative intensity ( ) of scintillation in rare gases. We measured the luminescence spectra using a VUV monochromator of known efficiency in order to obtain ( ). Measurements were performed in gaseous argon, krypton, and xenon in the pressure range from 1.

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Section: Principlementioning

confidence: 99%

Absolute number of scintillation photons emitted by alpha particles in rare gases

Saito

Tawara

Sanami

et al. 2002

IEEE Trans. Nucl. Sci.

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“…The physical processes leading to excimer fluorescence in rare gases in low density limit are very well known [3,4,12,13,14,15,16,17,18,19,20]. The potential curve of diatomic rare gas molecules in the ground state is repulsive except for a weak van der Waals attraction.…”

Section: Introductionmentioning

confidence: 99%

Environmental influence on the IR fluorescence of Xe2* molecules in electron beam excited Ar–Xe mixture at high density

et al. 2005

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Abstract. We report new measurements of the near infrared (NIR) Xe * 2 excimer fluorescence in an electronbeam-excited Ar (90%)-Xe (10 %) mixture at room temperature. Previous measurements up to a density N ≈ 2 × 10 26 m −3 discovered a broad excimer fluorescence band at ≈ 7800 cm −1 , whose center is redshifted by increasing N (A. F. Borghesani, G. Bressi, G. Carugno, E. Conti, and D. Iannuzzi, J. Chem. Phys., 115, 6042 (2001) [1]). The shift has been explained by assuming that the energy of the optical active electron in the molecule is shifted by the density-dependent Fermi shift and by accounting for the solvation effect due to the environment. We have extended the density range up to N ≈ 6 × 10 26 m −3 , confirming the previous measurements and extending the validity of the interpretative model. A detailed analysis of the width of the fluorescence band gives a value of 2.85 nm for the size of the investigated excimer state. Such a large value lends credence to the validity of the proposed explanation of the experimental findings.

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“…The kinetics of the processes leading to the formation and decay of excimers has been investigated at low pressures in several spectral-and time-resolved experiments in which lifetimes and rate constants have been determined [10][11][12][13], whereas the structure of the lowest lying excimer states has been investigated theoretically [14,15] and spectroscopically [16,17].…”

Section: Introductionmentioning

confidence: 99%

Infrared luminescence of Xe<inf>2</inf> excimers produced by electron impact in dense gas

Borghesani

Carugno²

2008

2008 IEEE International Conference on Dielectric Liquids

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We observed the infrared emission spectrum of Xe 2 excimers produced by bombarding pure Xe gas and a Ar-Xe mixture with 70 keV electrons. The spectrum is a continuum centered around 7800 cm -1 of width 900 cm -1 . A Franck-Condon analysis of its shape at low pressure (P=0.1 MPa) has allowed to infer that the emission is due to a bound-free transition between 0 u + and 0 g + molecular states correlated with 6p and 6s atomic limit, respectively. The spectrum shows a strong redshift and broadening as pressure is increased up to 3.3 MPa. The shift is explained in terms of dielectric screening and quantum multiple scattering. The different broadening in the pure gas and in the mixture is believed to be a manifestation of the quantum indistinguishability of identical particles.

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Time resolved study of the uv and near uv continuums of xenon

Cited by 96 publications

References 20 publications

Absolute number of scintillation photons emitted by alpha particles in rare gases

Absolute number of scintillation photons emitted by alpha particles in rare gases

Environmental influence on the IR fluorescence of Xe2* molecules in electron beam excited Ar–Xe mixture at high density

Infrared luminescence of Xe<inf>2</inf> excimers produced by electron impact in dense gas

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