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Journal of the Physical Society of Japan

Fluorescence Profiles of the Cs–D2Line

Isao Hirano

Published Jul 15, 1988• 2 citations
Publisher

Abstract

Fluorescence emitted from an absorption cell is measured and analyzed for the Cs–D 2 line as a function of laser frequency. The fluorescence spectra change distinguishably with the cell temperature. The theoretical fluorescence line shapes are obtained in close accord with the measured results taking into account the atomic density distribution in the cell.

DOI
10.1143/jpsj.57.2337

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Fluorescence emitted from an absorption cell is measured and analyzed for the Cs–D 2 line as a function of laser frequency. The fluorescence spectra change distinguishably with the cell temperature. The theoretical fluorescence line shapes are obtained in close accord with the measured results taking into account the atomic density distribution in the cell.
Photochemical formation of caesium hydride in a room temperature cell containing Cs vapour and H 2 under illumination of the mixture by laser radiation tuned to the D 2 atomic resonance line of Cs is reported. The chemical reaction is accompanied by dramatic changes in magnitude of the resonant absorption and fluorescence of Cs atoms in H 2 environment as compared with a pure Cs vapour case. A theoretical model, which takes into account all the optical and chemical processes involved at these densities, is developed. The effective rate of a two-step chemical reaction (1 ± 0.3) × 10 −10 cm 3 s −1 is determined from the fitting of experimental results to this model, exploiting the laser intensity dependence of the fluorescence signal. Continuous (several hours) illumination of the cell by radiation tuned to the Cs D 2 line results in decrease of the hydrogen pressure in the cell, which is an additional proof for the formation of CsH molecules. The proposed investigation technique is applicable for a large variety of resonant photochemical reactions. Possible application for isotope separation is discussed.
The high resolution spectroscopy of nanometric alkali-vapor layers has been made possible through the development of extremely thin cell.We present a detailed comparison of the fluorescence profiles amplitude and width, obtained in the extremely thin cell, both theoretically and experimentally.Experiments are performed on the D 2 line of Cs-vapor layer with thickness L = mλ, where m = 0.5, 0.75, 1, 1.25.The enhancement rate of the transition profiles width is not growing monotonously, but it is larger for L varying in the interval from L = 0.75λ to L = λ than that varying in the interval from L = λ to L = 1.25λ.The used theoretical model, based on the optical Bloch equations is in qualitative agreement with the experimental observations.
The effective radiation rate for Cs (6P3/2) resonance level in the presence of helium was determined. A cell filled with Cs metal and He at pressure P(He) (0-500 Pa) was established at T = 300 K. The cell was heated in the temperature range between 330 and 370 K, which produced Cs number densities approximately in the range between 10(12) and 10(13) cm(-3). Cs atoms were excited to the 6P3/2 state using a single-mode diode laser(pump laser). The transmission of the medium at the center of the Doppler envelope of the strong h. f. component of the CsD2 line due to hyperfine pumping alone amounts to approximately 5%. The assumption that has been made is that the lower-state hyperfine levels are populated in a statistical ratio. The excited-atom density and spatial distribution were mapped by monitoring the absorption of a counterpropagating single-mode diode laser beam (probe laser) tuned to the 6P3/2 --> 8S1/2 transition which could be translated parallel to the pump beam. In the presence of radiation trapping, the spontaneous radiation rate is multiplied by the transmission factor T6P3/2 -->1/2, which describes the average probability that photons emitted within the fluorescence detection region can pass through the optically thick vapor without being absorbed. The T6P3/2 --> 6S1/2 is related to the frequency dependent absorption cross section and the density and spatial distribution of atoms at the level of the transition. Position dependent 6P3/2 state densities were combined with the collisional broadening rate of 6P3/2 <-- 6S1/2 line due to the perturbation of both helium and cesium to yield T6P3/2 --> 6S1/2. The effective radiation rates of the Cs D2 line as a function of the He pressure P(He) were obtained. The helium caused line broadening and therefore increased the effective radiation rate. The fluorescence intensity I852 of the 6P3/2 --> 6S1/2 emission was measured simultaneously. The measured fluorescence ratios determined the ratios of the effective radiation rates at different He density. These ratios are in agreement with theoretical evaluation.