Collision frequency in air with crossed electric and magnetic fields

Bhiday, M. R.; Paithankar, A.S.; Sharda, B L

doi:10.1088/0508-3443/18/2/412

Cited by 3 publications

(1 citation statement)

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“…An attempt was made (Bagnall and Haydon 1965) to extend this equivalent pressure concept to molecular nitrogen, in which the above condition of constant mean free path is not valid. A similar attempt is made (Bhiday et al 1967) to apply the equivalent pressure concept to atmospheric air. This paper reports further the relevant measurements in air for which the assumption of constant collision frequency ( v = l /~) may not be true.…”

Section: Introductionmentioning

confidence: 99%

Two-Wavelength Phase-Shifting Low-Coherence Digital Holography

Tamano

Otaka

Hayasaki

2008

jjap

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The measurements of the first ionization coefficient alp for air, without and with transverse magnetic fields, are reported in this paper. These were carried out using coaxial cylindrical electrodes to reduce the loss of electrons due to their drift in the E x H direction. The range of measurement covered the values of Elp between 200 and 600 V cm-1 torr-1 and those of H/p between 200 and 1400 G torr-1. The validity of the equivalent pressure concept was tested for the complicated medium like air. It has been shown that a satisfactory agreement between the theoretical and experimental values of alp, Hip and E/p was obtained for low values of Elp (< 300 V cm-1 torr-l) provided the collision frequency was taken to be an increasing function of Elp, instead of a constant as was assumed for hydrogen. At higher values of E/p (> 300), however, the observed values of alp, Hlp and'Elp were below those calculated on the basis of the equivalent pressure concept. A few measurements of ./p were also carried out using the pressure variation technique, and its operational utility has been established from the identical nature of the results.

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Section: Introductionmentioning

confidence: 99%

Two-Wavelength Phase-Shifting Low-Coherence Digital Holography

Tamano

Otaka

Hayasaki

2008

jjap

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Measurement of Townsend's first ionization coefficient for air in transverse electric and magnetic fields

Bhiday¹,

Paithankar²,

Sharda³

1970

J. Phys. D: Appl. Phys.

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The measurements of the first ionization coefficient α/p for air, without and with transverse magnetic fields, are reported in this paper. These were carried out using coaxial cylindrical electrodes to reduce the loss of electrons due to their drift in the E×H direction. The range of measurement covered the values of E/p between 200 and 600 V cm−1 torr−1 and those of H/p between 200 and 1400 G torr−1. The validity of the equivalent pressure concept was tested for the complicated medium like air. It has been shown that a satisfactory agreement between the theoretical and experimental values of α/p, H/p and E/p was obtained for low values of E/p (<300 V cm−1 torr−1) provided the collision frequency was taken to be an increasing function of E/p, instead of a constant as was assumed for hydrogen. At higher values of E/p (> 300), however, the observed values of α/p, H/p and E/p were below those calculated on the basis of the equivalent pressure concept. A few measurements of α/p were also carried out using the pressure variation technique, and its operational utility has been established from the identical nature of the results.

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