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Acta Optica Sinica

Thermoelectronic diode used to detect Rydberg states in atoms——experimental observation and theoretical analysis

Li P

Published Jan 1, 1986• 0 citations
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Abstract

We have detected the two-photon absorption signals of Ba in a heat-pipe cell using a thermoelectronic diode. The relations between signal characteristics and pressure, temperature, bias voltage, position of interaction zone were studied both experimentally and theoretically.

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Effects of Temperature and Buffer Gas Pressure on Single Photon Degenerate Four-wave Mixing

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In order to study the Rydberg state of Barium atom,single photon resonant degenerate four-wave mixing(FWM)was used to measure the 6s6p1P1 energy level of Barium atom,and FWM specture signal under different experimental conditions were achieved.The results showed that the influence of temperature and laser intensity on FWM are relatively obvious but the buffer gas pressure is relatively poor.These results may serve as a useful reference in further research work on the Rydberg state of Barium atom.

Journal of Hebei University•Jan 1, 2010•0 citations
Doppler-free two-photon transitions to Rydberg states in alkali metals have been recommended as a potential source of reference lines or secondary standards for wavelength calibration, because they cover a wide range of the visible spectrum.1 Observation of spectral lines for the two-photon transitions was made possible by use of a thermionic diode detector cell similar to that originally designed by Harvey.2 The Pyrex cell enclosing the diode detector and containing natural Rb was placed in a two-chamber oven so that the temperature of the cell body and that of the sidearm Rb supply could be controlled independently.
Perturbed Rydberg series One of the most intensively studied manifestations of channel interaction in the bound states is the perturbation of the regularity of the Rydberg series, which is evident if one simply measures the energies of the atomic states. Although measurements of Rydberg energy levels by classical absorption spectroscopy show the perturbations in the series which are optically accessible from the ground state, the tunable laser has made it possible to study series which are not connected to the ground state by electric dipole transitions as well. One of the approaches which has been used widely is that used by Armstrong et al . As shown in Fig. 22.1, a heat pipe oven contains Ba vapor at a pressure of ∼1 Torr. Three pulsed tunable dye laser beams pass through the oven. Two are fixed in frequency, to excite the Ba atoms from the ground 6s 2 1 S o state to the 3 P 1 state and then to the 6s7s 3 S 1 state. The third laser is scanned in frequency over the 6s7s 3 S 1 → 6s n p transitions. The Ba atoms excited to the 6s n p states are ionized either by collisional ionization or by the absorption of another photon. The ions produced migrate towards a negatively biased electrode inside the heat pipe. The electrode has a space charge cloud of electrons near it which limits the emission current.
In order to study the Rydberg state of Barium atom,single photon resonant degenerate four-wave mixing(FWM)was used to measure the 6s6p1P1 energy level of Barium atom,and FWM specture signal under different experimental conditions were achieved.The results showed that the influence of temperature and laser intensity on FWM are relatively obvious but the buffer gas pressure is relatively poor.These results may serve as a useful reference in further research work on the Rydberg state of Barium atom.