Investigates the levels of the 2p 5 3p configuration of neon by studying the polarization of the light emitted by a dc neon discharge. The pressure broadening of the Hanle signals was studied and cross sections were obtained for the destruction of alignment for collisions with both helium and neon ground state atoms. The measurements have been made at 315 K and 85 K. The cross sections for the 2p 2 and 2p 6 levels (Paschen notation) change considerably with temperature, while the cross sections for other levels are almost independent of temperature.Investigates the levels of the 2p 5 3p configuration of neon by studying the polarization of the light emitted by a dc neon discharge. The pressure broadening of the Hanle signals was studied and cross sections were obtained for the destruction of alignment for collisions with both helium and neon ground state atoms. The measurements have been made at 315 K and 85 K. The cross sections for the 2p 2 and 2p 6 levels (Paschen notation) change considerably with temperature, while the cross sections for other levels are almost independent of temperature.

Journal of Physics B Atomic and Molecular PhysicsJun 1, 197141 citations

Mechanism of Generation Termination at the 5 2 P 1/2 -5 2 P 3/2 Transition in Iodine

V Yu Zalesskiĭ, А. А. Венедиктов

Journal of Experimental and Theoretical PhysicsJun 1, 19693 citations

Measurement of Probabilities of the Spontaneous 3s 2 -2p Transitions in Neon

T. V. Bychkova, V. G. Kirpilenko, Sergey G. Rautian +1 more

OptSpApr 1, 19670 citations

Hanle-effect studies on the (5p46s)P524 state of iodine

Lloyd G. Williams, David R. Crosley

Hanle-effect measurements have been made on the $(5{p}^{4}6s)^{4}P_{\frac{5}{2}}$ state of iodine, which is connected to the ground state via the 1830-\AA{} line. The atomic iodine is produced by thermal dissociation of ${\mathrm{I}}_{2}$ , and is excited by unpolarized resonance radiation. Using the value of ${g}_{J}$ obtained by Keiss and Corliss from high-field Zeeman splittings, we find a radiative life-time of 57.9 \ifmmode\pm\else\textpm\fi{} 1.4 nsec (all errors quoted are 67% confidence limits). Neither coherence narrowing nor self-broadening is observed, and we place an upper limit of 200 ${\mathrm{\AA{}}}^{2}$ on the latter process. Cross sections for broadening of the Hanle effect by the rare gases are found to be (in ${\mathrm{\AA{}}}^{2}$ ): He: 9.8 \ifmmode\pm\else\textpm\fi{} 1.1; Ne: 19.5 \ifmmode\pm\else\textpm\fi{} 1.6; Ar: 37.6 \ifmmode\pm\else\textpm\fi{} 3.1; Kr: 38.7 \ifmmode\pm\else\textpm\fi{} 3.8; Xe: 49.2 \ifmmode\pm\else\textpm\fi{} 3.1. The relative values of these cross sections are seen to be in agreement with the predictions of a van der Waals interaction.Hanle-effect measurements have been made on the $(5{p}^{4}6s)^{4}P_{\frac{5}{2}}$ state of iodine, which is connected to the ground state via the 1830-\AA{} line. The atomic iodine is produced by thermal dissociation of ${\mathrm{I}}_{2}$, and is excited by unpolarized resonance radiation. Using the value of ${g}_{J}$ obtained by Keiss and Corliss from high-field Zeeman splittings, we find a radiative life-time of 57.9 \ifmmode\pm\else\textpm\fi{} 1.4 nsec (all errors quoted are 67% confidence limits). Neither coherence narrowing nor self-broadening is observed, and we place an upper limit of 200 ${\mathrm{\AA{}}}^{2}$ on the latter process. Cross sections for broadening of the Hanle effect by the rare gases are found to be (in ${\mathrm{\AA{}}}^{2}$): He: 9.8 \ifmmode\pm\else\textpm\fi{} 1.1; Ne: 19.5 \ifmmode\pm\else\textpm\fi{} 1.6; Ar: 37.6 \ifmmode\pm\else\textpm\fi{} 3.1; Kr: 38.7 \ifmmode\pm\else\textpm\fi{} 3.8; Xe: 49.2 \ifmmode\pm\else\textpm\fi{} 3.1. The relative values of these cross sections are seen to be in agreement with the predictions of a van der Waals interaction.

Physical Review AFeb 1, 197410 citations

Cross Section of the Electron-Induced 6s-6p Transition in Cesium

Lorin Kay Hansen

Journal of Applied PhysicsJan 1, 196412 citations

Sensitized Fluorescence in Vapors of Alkali Atoms. XIII. 62P1/2−62P3/2 Excitation Transfer in Rubidium, Induced in Collisions with Noble Gas Atoms

I. N. Siara, E. S. Hrycyshyn, L. Krause

The cross sections for excitation transfer between the 62P fine-structure substates in rubidium, induced in collisions with noble gas atoms, have been determined in a series of sensitized fluorescence experiments. Mixtures of rubidium vapor and noble gases at pressures varying in the range 0–5 Torr were irradiated with each component of the second 2P rubidium doublet in turn and the following cross sections for 2P mixing were obtained from measurements of sensitised-to-resonance fluorescent intensity ratios. Rb–He: Q12(2P1/2 → 2P3/2) = 29.3 Å2; Q21(2P1/2 ← 2P3/2) = 19.0 Å2. Rb–Ne: Q12 = 10.3 Å2; Q21 = 6.4 Å2. Rb–Ar: Q12 = 24.0 Å2; Q21 = 14.9 Å2. Rb–Kr: Q12 = 23.2 Å2; Q21 = 14.6 Å2. Rb–Xe: Q12 = 43.9 Å2; Q21 = 27.7 Å2 In their dependence on the magnitude of the fine-structure splitting, the values are consistent with previously determined cross sections for mixing in the first and third 2P doublets of alkali atoms.The cross sections for excitation transfer between the 62P fine-structure substates in rubidium, induced in collisions with noble gas atoms, have been determined in a series of sensitized fluorescence experiments. Mixtures of rubidium vapor and noble gases at pressures varying in the range 0–5 Torr were irradiated with each component of the second 2P rubidium doublet in turn and the following cross sections for 2P mixing were obtained from measurements of sensitised-to-resonance fluorescent intensity ratios. Rb–He: Q12(2P1/2 → 2P3/2) = 29.3 Å2; Q21(2P1/2 ← 2P3/2) = 19.0 Å2. Rb–Ne: Q12 = 10.3 Å2; Q21 = 6.4 Å2. Rb–Ar: Q12 = 24.0 Å2; Q21 = 14.9 Å2. Rb–Kr: Q12 = 23.2 Å2; Q21 = 14.6 Å2. Rb–Xe: Q12 = 43.9 Å2; Q21 = 27.7 Å2 In their dependence on the magnitude of the fine-structure splitting, the values are consistent with previously determined cross sections for mixing in the first and third 2P doublets of alkali atoms.

Canadian Journal of PhysicsAug 15, 197219 citations

Hanle-effect measurements have been made on the

(5{p}^{4}6s)^{4}P_{\frac{5}{2}}

state of iodine, which is connected to the ground state via the 1830-\AA{} line. The atomic iodine is produced by thermal dissociation of

{\mathrm{I}}_{2}

, and is excited by unpolarized resonance radiation. Using the value of

{g}_{J}

obtained by Keiss and Corliss from high-field Zeeman splittings, we find a radiative life-time of 57.9 \ifmmode\pm\else\textpm\fi{} 1.4 nsec (all errors quoted are 67% confidence limits). Neither coherence narrowing nor self-broadening is observed, and we place an upper limit of 200

{\mathrm{\AA{}}}^{2}

on the latter process. Cross sections for broadening of the Hanle effect by the rare gases are found to be (in

{\mathrm{\AA{}}}^{2}

): He: 9.8 \ifmmode\pm\else\textpm\fi{} 1.1; Ne: 19.5 \ifmmode\pm\else\textpm\fi{} 1.6; Ar: 37.6 \ifmmode\pm\else\textpm\fi{} 3.1; Kr: 38.7 \ifmmode\pm\else\textpm\fi{} 3.8; Xe: 49.2 \ifmmode\pm\else\textpm\fi{} 3.1. The relative values of these cross sections are seen to be in agreement with the predictions of a van der Waals interaction.