Multiphoton ultraviolet spectroscopy of some<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mn>6</mml:mn><mml:mi>p</mml:mi></mml:math>levels in krypton

Bokor, Jeffrey; Zavelovich, J.; Rhodes, C. K.

doi:10.1103/physreva.21.1453

Cited by 72 publications

(7 citation statements)

References 26 publications

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“…The reason for the inconsistence between the krypton 3p level lifetimes lies in the cascade effect. In all cases when the cascade corrections were made correctly (3p2 , 3P6, 3p7 levels, for example) or when the cascade effect was completely reduced by the laser excitation [100] the values obtained by the temporary decay technique coincide with the Hanle effect results. Table 6 refer to the multiconfigurational approximation.…”

Section: Comparison Of Resultssupporting

confidence: 63%

“…The significant discrepancy despite the rather high accuracy of individual results between the lifetime values for 3P6 level given in the works [94,95,98] and that obtained in [95,98] for the 3pv level should be attributed to sistematic errors caused mainly by the cascade effect. In this respect the values obtained by the cascade free techniques [99,100] are assumed to be more reliable. The transition probability measurements [101] were performed by emission technique using the stabilized are with the total error of about 30 ~o.…”

Section: Comparison Of Resultsmentioning

confidence: 99%

“…The results for the krypton 2p and 3p levels are presented in Table 5. The delayed coincedence technique was used in the works [94,95,98] under electron beam and pulsed laser light [99,100] excitation. The significant discrepancy despite the rather high accuracy of individual results between the lifetime values for 3P6 level given in the works [94,95,98] and that obtained in [95,98] for the 3pv level should be attributed to sistematic errors caused mainly by the cascade effect.…”

Section: Comparison Of Resultsmentioning

confidence: 99%

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Accurate lifetime measurements for the noble gases by the electron beam alignment technique

Gorny¹,

Казанцев

Matisov³

et al. 1985

Z Physik A

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Accurate lifetime measurement for the 41P1, 41D2, 51D 2 helium and the atomic 2p and 3p states of other noble gases was performed by the low energy electron beam alignment technique. An account of the influence of magnetic field on the electron path was made to obtain the real Hanle signal shape. The influence of the radiation trapping in the collision chamber was analysed with regard to the metastables diffusion. The experimental data were compared with the results of other methods of the lifetime determination.

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Section: Comparison Of Resultssupporting

confidence: 63%

Section: Comparison Of Resultsmentioning

confidence: 99%

Section: Comparison Of Resultsmentioning

confidence: 99%

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Accurate lifetime measurements for the noble gases by the electron beam alignment technique

Gorny¹,

Казанцев

Matisov³

et al. 1985

Z Physik A

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“…Table III shows the two-photon cross sections for the 5p[1/2] 0 and 5p[3/2] 2 energy levels of krypton, corresponding to two-photon excitation using λ = 212.6 nm and λ = 214.7 nm, along with the corresponding atomic data used in the calculation. Furthermore, the magnetic quantum numbers are M g = M i = M f = 0 for both energy levels because the laser is linearly polarized [89], and ω L = 8.48 × 10 9 rad/s. Our calculations indicate that the 5p[1/2] 0 level has a larger two-photon cross section than the 5p[3/2] 2 level.…”

Section: Cross-section Calculationsmentioning

confidence: 99%

Single-Laser Krypton Tagging Velocimetry Investigation of Supersonic Air and N2 Boundary-Layer Flows over a Hollow Cylinder in a Shock Tube

2019

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In this paper, we investigate the boundary-layer profiles that form over a sharp, hollow cylinder in supersonic air and N 2 flows with a krypton tagging velocimetry (KTV) single-laser scheme. The supersonic flows are generated by the passage of the primary shock wave over the model in the Stevens shock tube. The experiments are performed in two gas mixtures doped with Kr: 99% N 2 /1% Kr, to model N 2 , and 75% N 2 /20% O 2 /5% Kr, to model air. The experimental setup allows us to vary the pressure and Reynolds number from 3-25 kPa and 1.5 × 10 5 to 1.5 × 10 6 m −1 , respectively, while the Mach number is kept fixed at 1.7. The static temperature and pressure (but not the velocity) are representative of typical large-scale high-enthalpy hypersonic impulse facilities. The KTV data points over the hollow cylinder are mapped to corresponding wall-normal locations above a flat plate, which enables comparison with the similarity solution for compressible boundary-layer flow. Agreement between the similarity solution and experimental results is excellent. Relative to previous two-laser KTV schemes, the single-laser approach used in this work has the advantage of being simpler and more cost effective, but it has a higher laserenergy requirement, 10 mJ/pulse in these experiments. Single-laser KTV is implemented by increasing the energy of the write-laser pulse to a sufficient level such that the Kr becomes partially ionized via a (2 + 1) resonance-enhanced, multiphoton ionization (REMPI) process with an excitation wavelength of 212.6 nm. The write step records the fluorescence that results primarily from the spontaneous emission from the two-photon excitation. After a prescribed delay, the read step records the fluorescence that results from the transitions that follow the recombination process. The signal-to-noise ratio (SNR) is sufficient to extract velocity profiles from single-shot, shock-tube experiments. Two-photon absorption cross-section calculations and emission spectra are presented to justify the chosen excitation wavelength and support our understanding of the Kr excitation and emission scheme.

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“…The formula is exact for hydrogenic atom and quite good for alkali atoms. 32,33 In the current study, a nitrogen-pumped dye laser at 578.9 nm was used for the 2 + 1 REMPI of a sodium atom. The one-photon ionization from the excited 4d state is pi = 2.058ϫ 10 −22 m 2 .…”

Section: ͑1͒mentioning

confidence: 99%

Measurement of plasma decay processes in mixture of sodium and argon by coherent microwave scattering

Shneider

2010

Physics of Plasmas

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This paper presents the experimental measurement and computational model of sodium plasma decay processes in mixture of sodium and argon by using radar resonance-enhanced multiphoton ionization ͑REMPI͒, coherent microwave Rayleigh scattering of REMPI. A single laser beam resonantly ionizes the sodium atoms by means of 2 + 1 REMPI process. The laser beam can only generate the ionization of the sodium atoms and have negligible ionization of argon. Coherent microwave scattering in situ measures the total electron number in the laser-induced plasma. Since the sodium ions decay by recombination with electrons, microwave scattering directly measures the plasma decay processes of the sodium ions. A theoretical plasma dynamic model, including REMPI of the sodium and electron avalanche ionization ͑EAI͒ of sodium and argon in the gas mixture, has been developed. It confirms that the EAI of argon is several orders of magnitude lower than the REMPI of sodium. The theoretical prediction made for the plasma decay process of sodium plasma in the mixture matches the experimental measurement.

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Multiphoton ultraviolet spectroscopy of some6plevels in krypton

Cited by 72 publications

References 26 publications

Accurate lifetime measurements for the noble gases by the electron beam alignment technique

Accurate lifetime measurements for the noble gases by the electron beam alignment technique

Single-Laser Krypton Tagging Velocimetry Investigation of Supersonic Air and N2 Boundary-Layer Flows over a Hollow Cylinder in a Shock Tube

Measurement of plasma decay processes in mixture of sodium and argon by coherent microwave scattering

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