Comment on 'Microwave attenuation of hydrogen plasma in carbon nanotubes' [J. Appl. Phys. 104, 124315 (2008)]
- Department of Nano Science, Kermanshah University of Technology, 67178-63766 Kermanshah, Iran and Department of Nano Science, Institute for Studies in Theoretical Physics and Mathematics (IPM), 19395-5531 Tehran (Iran, Islamic Republic of)
In a recent article, Babaei and Solari [J. Appl. Phys. 104, 124315 (2008)] studied the effects of the electron temperature, and the external static magnetic field on the attenuation (ATT) of the microwave in the hydrogen plasma embedded inside the carbon nanotubes (CNTs), which were grown by iron-catalyzed high-pressure disproportionation (HiPco). They showed that the position of ATT peak shifts significantly toward high frequency with increasing thermal frequency and in the presence of an external magnetic field in the Faraday configuration, for {upsilon}{sub c}<20 GHz, the ATT coefficient increases with increasing cyclotron frequency, and for {upsilon}{sub c}>20 GHz, the ATT level variations extremely increase, where {upsilon}{sub c} is the cyclotron frequency. Here we derive the correct form of the microwave absorption coefficient of the magnetized hydrogen plasma embedded inside the CNTs and show that the absorption band moves from low to high frequencies when the magnetic field strength increases. Also, we show that the ATT of the microwave in the system is not sensitive to the thermal frequency.
- OSTI ID:
- 21480230
- Journal Information:
- Journal of Applied Physics, Vol. 107, Issue 6; Other Information: DOI: 10.1063/1.3357396; (c) 2010 American Institute of Physics; ISSN 0021-8979
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
ABSORPTION
ATTENUATION
CARBON
CYCLOTRON FREQUENCY
ELECTRON TEMPERATURE
GHZ RANGE
HYDROGEN
ION TEMPERATURE
IRON
MAGNETIC FIELDS
MAGNETOHYDRODYNAMICS
MICROWAVE RADIATION
NANOTUBES
OXIDATION
PLASMA
REDUCTION
CHEMICAL REACTIONS
ELECTROMAGNETIC RADIATION
ELEMENTS
FLUID MECHANICS
FREQUENCY RANGE
HYDRODYNAMICS
MECHANICS
METALS
NANOSTRUCTURES
NONMETALS
RADIATIONS
SORPTION
TRANSITION ELEMENTS