Evidence for Rb‐Rare‐Gas Molecules from the Relaxation of Polarized Rb Atoms in a Rare Gas. Experimental Results

1972 ◽  
Vol 56 (7) ◽  
pp. 3703-3714 ◽  
Author(s):  
M. A. Bouchiat ◽  
J. Brossel ◽  
L. C. Pottier
Keyword(s):  
Experimental Results ◽  
Rare Gas ◽  
Gas Molecules

scholarly journals Thermal Steady States of Gases in a Gravitational Field

2011 ◽  
Vol 66 (1-2) ◽  
pp. 123-133
Author(s):  
Kunihiko Kigoshi
Keyword(s):  
Heat Transfer ◽  
Gravitational Field ◽  
Temperature Difference ◽  
Thermal Gradient ◽  
Vertical Direction ◽  
Steady States ◽  
Gas Pressure ◽  
Experimental Results ◽  
Gravity Effect ◽  
Gas Molecules

This paper presents results on observations of a temperature difference between the top and bottom of a vessel filled with gas in a gravitational field. The observed temperature at the top of the vessel was always lower than the temperature at the bottom of the vessel, and this temperature difference was persistent and steady over more than 20 h. The magnitude of the temperature difference depends on the types of gas molecules present but is independent of the gas pressure in the vessel within the range from 2.7×104 Pa to 27 Pa. A temperature difference between the top and the bottom is only observed along the vertical direction and is only observed when the vessel contains a gas. These experimental results indicate a gravity effect on molecular heat transfer which enables the transport of energy in the gas without a thermal gradient.

A study of argon metastable generation in a hollow cathode arc

1984 ◽  
Vol 62 (2) ◽  
pp. 141-147
Author(s):  
Marc Fortin ◽  
Paul Meubus
Keyword(s):  
Hollow Cathode ◽  
Potential Energy Curve ◽  
Arc Discharge ◽  
Rare Gas ◽  
Energy Curve ◽  
Helium Mixture ◽  
Wavelength Scale ◽  
Gas Molecules ◽  
Cathode Arc ◽  
Radiation Measurements

A study is made of the intense spectroscopic continuum obtained between 120 and 180 nm for an argon–helium mixture (15% He) deexcitation, the emission originating from a hollow cathode arc discharge operated at 2900 K and a calculated pressure of 20 kPa. The deexcitation of the excimers toward the repulsive fundamental level gives way to an ultraviolet (UV) continuum, which is a characteristic of the potential energy curve for these molecules and whose position in the wavelength scale depends on the temperature of the hollow cathode. This continuum is identified as the second Tanaka continuum.Absolute radiation measurements have been made with a gold coated photocathode in order to determine the excited rare gas molecules [Formula: see text] concentration, which is in the order of 7 × 1013 cm−3.Such concentrations are high and seem to be related to the generation means used (hollow cathode).The spectroscopic results obtained with the indicated specific argon–helium mixture imply a major contribution of a precursor of the type (He–Ar)+ for the [Formula: see text] metastable formation.

Evidence for Rb-Rare-Gas Molecules from the Relaxation of Polarized Rb Atoms in a Rare Gas. Theory

1969 ◽  
Vol 181 (1) ◽  
pp. 144-165 ◽  
Author(s):  
C. C. Bouchiat ◽  
M. A. Bouchiat ◽  
L. C. L. Pottier
Keyword(s):  
Rare Gas ◽  
Gas Molecules

Photoionization studies of the diatomic heteronuclear rare gas molecules XeKr, XeAr, and KrAr

1977 ◽  
Vol 66 (12) ◽  
pp. 5737-5743 ◽  
Author(s):  
C. Y. Ng ◽  
P. W. Tiedemann ◽  
B. H. Mahan ◽  
Y. T. Lee
Keyword(s):  
Rare Gas ◽  
Gas Molecules

Evidence for the Formation of Neutral Rare‐Gas Molecules by Electron‐Beam Pulses

1969 ◽  
Vol 50 (10) ◽  
pp. 4575-4589 ◽  
Author(s):  
Shigeyoshi Arai ◽  
Richard F. Firestone
Keyword(s):  
Electron Beam ◽  
Rare Gas ◽  
Gas Molecules
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