Paramagnetic resonance of molecular oxygen in condensed phases

Kon, Hideo

doi:10.1021/ja00785a009

Cited by 36 publications

(30 citation statements)

References 2 publications

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“…ESR line shape of O 2 molecules in D 2 and HD is similar to that in the other classical molecular solids such as N 2 and CO previously reported, [10][11][12] indicating that rotation of O 2 molecules is strongly hindered to be oscillation states even in D 2 and HD. The hindered rotation has been discussed throughout the analysis of ESR spectra which was established in the 1970s.…”

Section: A Rotation Of O 2 Moleculessupporting

confidence: 80%

“…Thus, the ESR spectroscopy has extensively been used to study O 2 rotations in classical molecular solids, such as N 2 , CO, CD 4 , Ar, and air. [10][11][12][13][14][15] Kon 10 has found by the ESR study of 16 O 2 and 18 O 2 in solid N 2 that resonance magnetic field of the peak of ESR absorption signal varies as a function of torsional oscillation amplitude of O 2 molecules trapped in the matrix. Recently, the author first succeeded in observing ESR spectra of O 2 molecules in solid D 2 and HD, and their pressure dependence.…”

Section: Introductionmentioning

confidence: 99%

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Rotation of O2 molecules in solid D2 and HD: An electron spin resonance study

Kumada

2002

The Journal of Chemical Physics

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X-band electron spin resonance (ESR) spectroscopy has been applied to the study of molecular rotation of O2 molecules in isotopic solid hydrogen, D2 and HD. ESR signal of the O2 molecules in hindered rotational states has been observed, and its pressure dependence has been measured up to 19 MPa. Although molar volume of solid hydrogen decreases, the O2 rotation has become less hindered with the increase in pressure and isotope substitution from HD to D2. These effects of pressure and isotope substitution suggest that the potential barrier for the O2 rotation is mainly produced by distortion of O2 cages in D2 and HD. Since solid hydrogen becomes less compressible with the increase in pressure and the isotope substitution from HD to D2, the O2 rotation becomes less hindered in the less distorted O2 cages.

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Section: A Rotation Of O 2 Moleculessupporting

confidence: 80%

Section: Introductionmentioning

confidence: 99%

Rotation of O2 molecules in solid D2 and HD: An electron spin resonance study

Kumada

2002

The Journal of Chemical Physics

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“…This is simply because the large broadening of molecular oxygen due to a large zero-field splitting (ZFS) interaction fluctuating by its rotational motion prevents us from taking ESR spectrum. Spectra of molecular oxygen in the ground state were measured by ESR method only in gas phase [13] and in low temperature matrix [14].…”

Section: Introductionmentioning

confidence: 99%

CIDEP in radical-singlet molecular oxygen system

et al. 1997

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Abstraet. Net absorptive CIDEP generation has been demonstrated on singlet molecular oxygen and 4-oxo-2,2,6,6-tetramethyl-l-piperidinyloxyl (OTEMPO) radical system in benzene. CIDEP generation was reasonably explained in terms of the radical-triplet pair mechanism of triplet molecular oxygen-OTEMPO pair with doublet precursor. Several excited molecule-OTEMPO systems have been investigated if this CIDEP generation cont¡ to their CIDEP spectra. Surprisingly strong CIDEP was produced even in the presente of trace amount of dissolved oxygen, which suggests the importante of complete degassing for CIDEP studies in general systems.

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“…EPR spectra of O 2 have been observed at low temperature in nitrogen and in CO 2 matrices at both X-and Q-band microwave frequencies (7). The signals arising from O 2 that are observed using X-band EPR at low temperature can indeed be attributed to an S ϭ 1 species with large zero field splitting (zfs), but these triplet spectra are obviously incomplete as they show only one component (see below).…”

mentioning

confidence: 99%

“…The close resemblance between the fixed axis value of the zfs parameter for the trapped molecule (3.93 cm Ϫ1 ) and that reported for the gas phase molecule (3.96 cm Ϫ1 ) must be fortuitous. It may be of some interest in molecular physics to repeat the experiments of references (1,7,8) at the high frequencies and fields now available in a number of laboratories.…”

mentioning

confidence: 99%