Reduced Doppler absorption profile in atomic and molecular beams

Безуглов, Н. Н.; Zakharov, M. Yu.; Klyucharev, A. N.; Matveev, A. A.; Michulis, K.; Saks, E.; Sydoryk, I.; Экерс, А.

doi:10.1134/s0030400x07060033

Cited by 4 publications

(10 citation statements)

References 5 publications

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“…A corresponding replacement δ → δ +∆ω should therefore be done in Eq. (17). The resultant profile of a line in the excitation spectrum is thus given by a sum of profiles (17) resulting from absorption of laser photons by atoms of different velocity groups.…”

Section: Residual Doppler Broadeningmentioning

confidence: 99%

“…The analytical form of the function P D (∆ω) for effusive beams has been derived in [17], while for the case of supersonic beams it will be analyzed in detail in [18]. This analysis builds on the following assumptions: (i) nozzle diameter d is small compared to the diameter b of the entrance aperture and distance L from the nozzle to the excitation zone (see Fig.…”

Section: Residual Doppler Broadeningmentioning

confidence: 99%

“…When the pumping parameter is small (P pump ≪ 1), equation (17) simplifies to yield the ordinary Lorentz lineshapes:…”

Section: B Line Broadening By Optical Pumpingmentioning

confidence: 99%

“…( 17). The resultant profile of a line in the excitation spectrum is thus given by a sum of profiles (17) resulting from absorption of laser photons by atoms of different velocity groups. If the probability of atoms to have a velocity leading to the Doppler shift ∆ω is P D (∆ω), then the resultant line profile is given by the integral…”

Section: Residual Doppler Broadeningmentioning

confidence: 99%

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Broadening and intensity redistribution in theNa(3p)hyperfine excitation spectra due to optical pumping in the weak excitation limit

et al. 2008

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Detailed analysis of spectral line broadening and variations in relative intensities of hyperfine spectral components due to optical pumping is presented. Hyperfine levels of sodium 3p 1/2 and 3p 3/2 levels are selectively excited in a supersonic beam at various laser intensities under the conditions when optical pumping time is shorter than transit time of atoms through the laser beam. The excitation spectra exhibit significant line broadening at laser intensities well below the saturation intensity, and redistribution of intensities of hyperfine spectral components is observed, which in some cases is contradicting with intuitive expectations. Theoretical analysis of the dynamics of optical pumping shows that spectral line broadening depends sensitively on branching coefficient of the laser-driven transition. Analytical expressions for branching ratio dependent critical Rabi frequency and critical laser intensity are derived, which give the threshold for onset of noticeable line broadening by optical pumping. The critical laser intensity has its smallest value for transitions with branching coefficient equal to 0.5, and it can be much smaller than the saturation intensity. Transitions with larger and smaller branching coefficients are relatively less affected. The theoretical excitation spectra were calculated numerically by solving density matrix equations of motion using the split propagation technique, and they well reproduce the observed effects of line broadening and peak intensity variations. The calculations also show that presence of dark (i.e., not laser-coupled) Zeeeman sublevels in the lower state results in effective branching coefficients which vary with laser intensity and differ from those implied by the sum rules, and this can lead to peculiar changes in peak ratios of hyperfine components of the spectra.

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Section: Residual Doppler Broadeningmentioning

confidence: 99%

Section: Residual Doppler Broadeningmentioning

confidence: 99%

“…When the pumping parameter is small (P pump ≪ 1), equation (17) simplifies to yield the ordinary Lorentz lineshapes:…”

Section: B Line Broadening By Optical Pumpingmentioning

confidence: 99%

Section: Residual Doppler Broadeningmentioning

confidence: 99%

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Broadening and intensity redistribution in theNa(3p)hyperfine excitation spectra due to optical pumping in the weak excitation limit

et al. 2008

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“…Until now, experimental and theoretical studies of photoplasma have focused on pulsed laser-induced gas photoplasma the laser interaction based on resonance saturation project [15,20,21] and other works [10,[22][23][24][25]. In the 1930s, the earlier experimental work of [26] showed the formation of a quasistationary plasma with an electron density of ∼10 18 m −3 and an electron temperature of 1000 K of cesium vapor at cesium pressure of (0.01 ∼ 0.1 Torr) with irradiation of a cesium discharge lamp.…”

Section: Introductionmentioning

confidence: 99%

2D simulation of solar/lamp two-chamber photoelectric converter with different sodium–noble gas mixtures

Mandour¹,

Astashkevich²,

Kudryavtsev³

2020

Plasma Sources Sci. Technol.

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This work is devoted to the numerical analysis of the opportunity to obtain a steady generation of electromotive force (EMF) in a two-chamber gas cell exposed to concentrated solar/lamp radiation. For this purpose, we have carried out 2D simulations of the low-pressure photoplasma in the mixtures of sodium atom vapor and different noble gases and their pressures at different values of photoexcitation rate of resonance levels of Na. Herewith plasma chemistry and transfer of charges and radiation in the volume have been taken into account. It has been established that argon is a better candidate to be used as a buffer gas for photoplasma electric converter based on the obtained plasma parameters and commercial aspects. A parametric study has been carried out for the Na–Ar mixture to investigate the effect of increasing homogeneous photoexcitation rate in the small chamber on plasma parameters and obtained EMF. Another parametric study has been conducted to calculate the output current and electric power at a loaded chain. The results show that EMF could be obtained using the photovoltaic effect in photoplasma for the two-chamber cell. The present paper gives a key to the understanding of the effect of different processes (radiation, chemical, and electric) in the cell with these gas mixtures. The obtained results can be used in projecting a solar photoelectric converter based on a two-chamber device with a mixture of sodium and noble gases.

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Analytical model of transit time broadening for two-photon excitation in a three-level ladder and its experimental validation

et al. 2012

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Reduced Doppler absorption profile in atomic and molecular beams

Cited by 4 publications

References 5 publications

Broadening and intensity redistribution in theNa(3p)hyperfine excitation spectra due to optical pumping in the weak excitation limit

Broadening and intensity redistribution in theNa(3p)hyperfine excitation spectra due to optical pumping in the weak excitation limit

2D simulation of solar/lamp two-chamber photoelectric converter with different sodium–noble gas mixtures

Analytical model of transit time broadening for two-photon excitation in a three-level ladder and its experimental validation

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