A time-resolved electron spin resonance study of the hydrogen atom
Thesis/Dissertation
·
OSTI ID:6903940
A time resolved electron spin resonance investigation of the hydrogen atom has been carried out in a single radical system. An experimental apparatus has been constructed wherein experiments may be conducted simply and routinely on flowing solutions at pressures of up to one hundred atmospheres. The radicals were generated by the pulse radiolysis of triply distilled water and heavy water samples which were first saturated with nitrous oxide, then pressurized with hydrogen gas at one hundred atmospheres. In this way, the hydroxyl radical and the hydrated electron were both converted to hydrogen atoms within the microsecond time resolution of the spectrometer. The time dependence of the hydrogen atom signals, obtained at a range of initial radical concentrations and microwave power levels, were fitted using the Bloch equations modified to include electron spin polarization processes (CIDEP) and relaxation due to chemical reaction and spin exchange. The data were fitted to these equations using a non-linear least squares fitting routine. The rate constant used for the hydrogen atom self reaction was 1.55 {times} 10{sup 10} M{sup {minus}1} s{sup {minus}1}. The spin/lattice and spin/spin relaxation times are 30 {plus minus} 3 {mu}s, the rate of Heisenberg spin exchange was measured at 2k{sub HSE} = 6.2 {times} 10{sup 10} M{sup {minus}1} s{sup {minus}1}.
- Research Organization:
- Notre Dame Univ., IN (USA)
- OSTI ID:
- 6903940
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
38 RADIATION CHEMISTRY, RADIOCHEMISTRY, AND NUCLEAR CHEMISTRY
400600 -- Radiation Chemistry
640302* -- Atomic
Molecular & Chemical Physics-- Atomic & Molecular Properties & Theory
74 ATOMIC AND MOLECULAR PHYSICS
CALCULATION METHODS
CHEMICAL RADIATION EFFECTS
CHEMICAL REACTIONS
CHEMISTRY
DATA
DATA ANALYSIS
DECOMPOSITION
ELECTRON SPIN RESONANCE
ELEMENTS
EXPERIMENTAL DATA
HEAVY WATER
HYDROGEN
HYDROGEN COMPOUNDS
INFORMATION
MAGNETIC RESONANCE
MEASURING INSTRUMENTS
MEASURING METHODS
NONMETALS
NUMERICAL DATA
OXYGEN COMPOUNDS
RADIATION CHEMISTRY
RADIATION EFFECTS
RADICALS
RADIOLYSIS
RELAXATION
RESONANCE
SPIN-SPIN RELAXATION
WATER
400600 -- Radiation Chemistry
640302* -- Atomic
Molecular & Chemical Physics-- Atomic & Molecular Properties & Theory
74 ATOMIC AND MOLECULAR PHYSICS
CALCULATION METHODS
CHEMICAL RADIATION EFFECTS
CHEMICAL REACTIONS
CHEMISTRY
DATA
DATA ANALYSIS
DECOMPOSITION
ELECTRON SPIN RESONANCE
ELEMENTS
EXPERIMENTAL DATA
HEAVY WATER
HYDROGEN
HYDROGEN COMPOUNDS
INFORMATION
MAGNETIC RESONANCE
MEASURING INSTRUMENTS
MEASURING METHODS
NONMETALS
NUMERICAL DATA
OXYGEN COMPOUNDS
RADIATION CHEMISTRY
RADIATION EFFECTS
RADICALS
RADIOLYSIS
RELAXATION
RESONANCE
SPIN-SPIN RELAXATION
WATER