Pressure Dependence of Rotational Intensity Distribution in C2 ``Swan'' Emission from Low‐Pressure Oxyacetylene Flames

1966 ◽  
Vol 45 (8) ◽  
pp. 3153-3154 ◽  
Author(s):  
R. Bleekrode
Keyword(s):  
Intensity Distribution ◽  
Pressure Dependence ◽  
Low Pressure

scholarly journals Thermalization in Infrared Multiple Photon Induced Reactions. The Pressure Dependence of the Trans → Cis Isomerization of Crotonitrile

1990 ◽  
Vol 10 (4) ◽  
pp. 227-238 ◽  
Author(s):  
Joseph R. Guckert ◽  
Robert W. Carr
Keyword(s):  
Laser Radiation ◽  
Pressure Dependence ◽  
Pressure Range ◽  
Laser Pulses ◽  
Low Pressure ◽  
Trans Form ◽  
Collisional Regime

The infrared multiple photon trans → cis isomerization of crotonitrile was studied over the pressure range 0.02 torr to 10 torr at fluences of approximately 4J/cm2 using collimated TEA CO2 laser radiation at 942 cm-1. Only minor quantifies of fragmentation products were found at these conditions. At pressures of 0.1 torr or less, the trans form was completely converted to cis form by about 5000 laser pulses. On increasing the pressure a collisional regime was entered in which photostationary states were reached with fewer pulses and having smaller conversions than at low pressure. Both the number of pulses and the conversion decreased monotonically with increasing pressure. The tactic of driving the reaction in the exothermic direction gave evidence that the reaction does not occur solely by thermal isomedzation even in the highly eollisional 10 torr experiments, but that it still has a nonthermal component due to laser induced isomerization.

Low Pressure Dependence of the Electrical Conductivity in Doped Polypyrrole

1995 ◽  
Vol 191 ◽  
pp. 135-140
Author(s):  
V. Skákalová ◽  
Pavol Fedorko ◽  
J. Annus ◽  
D. Végh ◽  
M. Landl
Keyword(s):  
Electrical Conductivity ◽  
Pressure Dependence ◽  
Low Pressure

Reactor Pressure Dependence of Properties of Undoped ZnSe Grown by Low-Pressure OMVPE

1984 ◽  
Author(s):  
Shigeo FUJITA ◽  
Tokuo YODO ◽  
Yoshinobu MATSUDA ◽  
Akio SASAKI
Keyword(s):  
Pressure Dependence ◽  
Low Pressure ◽  
Reactor Pressure

Predissociation in the spectrum of OH; the vibrational and rotational intensity distribution in flames

1951 ◽  
Vol 208 (1092) ◽  
pp. 63-75 ◽  
Keyword(s):  
Reaction Zone ◽  
Intensity Distribution ◽  
Atmospheric Pressure ◽  
Low Pressure ◽  
The Other ◽  
Spin Component ◽  
Reverse Process ◽  
Free Atoms

In the main 3064 Å system of OH higher rotational levels of bands with v' = 1 and all levels with v' ≥ 2 are affected by a weak predissociation. One spin component of the 2Ʃ + levels is more strongly affected than the other. Of the three molecular states, 4II, 4Ʃ ¯ and 2Ʃ ¯ which could conceivably cause the predissociation, only the 2Ʃ ¯ could produce this effect. The predissociation is observed in the OH bands from a discharge and from the reaction zone of an oxy-acetylene flame at low pressure, and also to some extent in a flame at atmospheric pressure. The predissociation, and its reverse process, a ‘pre-association’, may also affect the vibrational intensity distribution if there is departure from equilibrium. Striking anomalies of this type in hydrogen flames are interpreted in this way. For flames at 1 atm. pressure there appears to be an excess of free atoms in the flame, and at low-pressure emission of radiation from the flame disturbs the equilibrium.

Reactor pressure dependence of properties of undoped ZnSe grown by low-pressure omvpe

1985 ◽  
Vol 71 (1) ◽  
pp. 169-172 ◽  
Author(s):  
Shigeo Fujita ◽  
Tokuo Yodo ◽  
Yoshinobu Matsuda ◽  
Akio Sasaki
Keyword(s):  
Pressure Dependence ◽  
Low Pressure ◽  
Reactor Pressure
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