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Journal of Physics B Atomic Molecular and Optical Physics

Detection of produced in the photodissociation of

J. B. Nee, Jixin Yang, P C Lee, X Y Wang, Chie‐Tong Kuo

Published Dec 14, 1998• 12 citations
Publisher

Abstract

The metastable atoms produced by the photodissociation of are detected by observing the enhanced fluorescence of the transition - in the buffer gas xenon. The photodissociation experiments are carried out under conditions of low-pressure (about 100 mtorr) in high-pressure Xe (20-200 torr). The fluorescence spectrum of ) in the wavelength region 510-560 nm is measured. A strong production of is found at wavelengths between 120 and 140 nm in the state, and a small production observed in the range 105-120 nm. Both spectra seem continuous. The Rydberg states in this wavelength region produce very little O(1S).

DOI
10.1088/0953-4075/31/23/014

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The metastable atoms produced by the photodissociation of are detected by observing the enhanced fluorescence of the transition - in the buffer gas xenon. The photodissociation experiments are carried out under conditions of low-pressure (about 100 mtorr) in high-pressure Xe (20-200 torr). The fluorescence spectrum of ) in the wavelength region 510-560 nm is measured. A strong production of is found at wavelengths between 120 and 140 nm in the state, and a small production observed in the range 105-120 nm. Both spectra seem continuous. The Rydberg states in this wavelength region produce very little O(1S).
It is known that fluorescence of trapped Yb+{\mathrm{Yb}}^{+}Yb+ ions fades with continuous driving of the 2^{2}2 S1/2{\mathrm{S}}_{1\mathrm{/}2}S1/2​${\mathrm{\ensuremath{-}}}^{2}$P1/2{\mathrm{P}}_{1\mathrm{/}2}P1/2​ transition in the presence of buffer gases. This phenomenon has been interpreted as being caused by population trapping in the 2^{2}2 F7/2{\mathrm{F}}_{7\mathrm{/}2}F7/2​ state of Yb+{\mathrm{Yb}}^{+}Yb+ . As another cause of the fluorescence disappearance, we found the production of YbH+{\mathrm{YbH}}^{+}YbH+ by chemical reaction of Yb+{\mathrm{Yb}}^{+}Yb+ in excited states with H2{\mathrm{H}}_{2}H2​ gas. We found that the wavelengths of 369.482, 369.202, and 368.947 nm, formerly assigned as wavelengths for deexcitation of Yb+{\mathrm{Yb}}^{+}Yb+ in the 2^{2}2 F7/2{\mathrm{F}}_{7\mathrm{/}2}F7/2​ state to the 2^{2}2 S1/2{\mathrm{S}}_{1\mathrm{/}2}S1/2​ ground state, are actually photodissociation lines of YbH+{\mathrm{YbH}}^{+}YbH+ . The change of the resonance point of rf resonance absorption signals indicates the production and dissociation of YbH+{\mathrm{YbH}}^{+}YbH+ ions. The production of YbH+{\mathrm{YbH}}^{+}YbH+ may be a problem in establishing frequency standards using buffer-gas-cooled Yb+{\mathrm{Yb}}^{+}Yb+ , owing to difficulty in removing H2{\mathrm{H}}_{2}H2​ gas from vacuum systems.
The UV absorption spectra of thallium halide vapors consist of a series of peaks corresponding to various photodissociation channels leading to the formation of different states of the product atoms.1 There has been renewed interest in determining the yields of different states of the metal atom produced by photodissociation of the thallium halides, particularly with a view to establishing conditions for selective production of metastable excited states for anti-Stokes Raman shitting2 and other purposes.
Experimental data are presented which demonstrate superfluorescent radiation due to stimulated transitions between the lowest-bound diatomic states of xenon and the repulsive ground state. In this context, superfluorescence describes a condition where, even in the absence of feedback, radiation from the fluorescent medium is dominated by stimulated transitions. The continuum emission spectrum was highly anisotropic and narrowing of the spectrum was observed. The optical gain was greatest at a wavelength of 1730 ± 10 Å, where the experimentally estimated effective gain cross section is 1 × 10−18 cm2.
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