Microwave afterglow studies of electron-ion recombination at low temperatures
Thesis/Dissertation
·
OSTI ID:5013740
A specially constructed low temperature microwave afterglow mass spectrometer apparatus employing microwave heating of the electrons has been used to study the dissociative recombination of the complex molecular ions Ne/sub 3//sup +/, H/sub 3//sup +/, and H/sub 5//sup +/ with electrons. The measured electron decays in recombination controlled afterglows are fitted by computer solutions of the continuity equation containing recombination and ambipolar diffusion loss terms. At approx. = 80K and approx. = 6 Torr of neon, Ne/sub 3//sup +/ is the dominant afterglow ion. The recombination coefficient, ..cap alpha..(Ne/sub 3//sup +/), has been determined over the range 80K less than or equal to T/sub e/ less than or equal to 4000K, and the result may be expressed as ..cap alpha..(Ne/sub 3//sup +/) = (1.1 +/- 0.1) x 10/sup -6/((T/sub e/)/(300))/sup -0/ /sup 36/cm/sup 3//sec with T/sub +/ = T/sub g/ = 80K. This trimer ion exhibits a dependence on electron temperature similar to that predicted and measured for diatomic ions but a larger (> 10/sup -6/cm/sup 3//sec) room temperature rate coefficient. Admixtures of approx. = 1 mTorr of H/sub 2/ in 20 Torr of neon at 265K lead to an H/sub 3//sup +/ dominated afterglow. The recombination coefficient, ..cap alpha..(H/sub 3//sup +/) varies little over the range 256 less than or equal to T/sub e/ < approx. = 400K, then approaches a T/sub e//sup (-0/88)/ variation, i.e., ..cap alpha..(H/sub 3//sup +/) = (2.0 +/- 0.3) x 10/sup -7/((T/sub e/)/(300))/sup -0/ /sup 88/ cm/sup 3//sec for approx. = 400K
- Research Organization:
- Pittsburgh Univ., PA (USA)
- OSTI ID:
- 5013740
- Country of Publication:
- United States
- Language:
- English
Similar Records
Dissociation Energy and Dissociative Recombination of Ne{sub 2}{sup +} and HeNe{sup +} Ions
Electron-temperature dependence of recombination of electrons with H/sub 3/O/sup +/ x (H/sub 2/O)/sub n/-series ions
Inference of electron-ion recombination coefficients from microwave-afterglow measurements employing microwave heating of electrons
Journal Article
·
Wed May 15 00:00:00 EDT 2019
· Journal of Experimental and Theoretical Physics
·
OSTI ID:22917742
Electron-temperature dependence of recombination of electrons with H/sub 3/O/sup +/ x (H/sub 2/O)/sub n/-series ions
Journal Article
·
Sat Jul 01 00:00:00 EDT 1978
· Phys. Rev., A; (United States)
·
OSTI ID:6666864
Inference of electron-ion recombination coefficients from microwave-afterglow measurements employing microwave heating of electrons
Thesis/Dissertation
·
Tue Dec 31 23:00:00 EST 1985
·
OSTI ID:7128670
Related Subjects
640302* -- Atomic
Molecular & Chemical Physics-- Atomic & Molecular Properties & Theory
74 ATOMIC AND MOLECULAR PHYSICS
AFTERGLOW
AMBIPOLAR DIFFUSION
CHARGED PARTICLES
COMPUTER CALCULATIONS
DIFFUSION
ELECTRONS
ELEMENTARY PARTICLES
ELEMENTS
FERMIONS
FLUIDS
GASES
HEATING
HIGH TEMPERATURE
HYDROGEN
IONS
LEPTONS
LOW PRESSURE
LOW TEMPERATURE
MASS SPECTROMETERS
MEASURING INSTRUMENTS
MEDIUM TEMPERATURE
MICROWAVE HEATING
MOLECULAR IONS
NEON
NONMETALS
RARE GASES
RECOMBINATION
SPECTROMETERS
VERY HIGH TEMPERATURE
Molecular & Chemical Physics-- Atomic & Molecular Properties & Theory
74 ATOMIC AND MOLECULAR PHYSICS
AFTERGLOW
AMBIPOLAR DIFFUSION
CHARGED PARTICLES
COMPUTER CALCULATIONS
DIFFUSION
ELECTRONS
ELEMENTARY PARTICLES
ELEMENTS
FERMIONS
FLUIDS
GASES
HEATING
HIGH TEMPERATURE
HYDROGEN
IONS
LEPTONS
LOW PRESSURE
LOW TEMPERATURE
MASS SPECTROMETERS
MEASURING INSTRUMENTS
MEDIUM TEMPERATURE
MICROWAVE HEATING
MOLECULAR IONS
NEON
NONMETALS
RARE GASES
RECOMBINATION
SPECTROMETERS
VERY HIGH TEMPERATURE