FRINK Linked Data Fragments server

Matches in SemOpenAlex for { <https://semopenalex.org/work/W1969206507> ?p ?o ?g. }

• W1969206507 endingPage "311" @default.
• W1969206507 startingPage "299" @default.
• W1969206507 abstract "Measurements of the proton spin-lattice relaxation time in solid and liquid HD containing ${mathrm{H}}_{2}$ (and a smaller amount of ${mathrm{D}}_{2}$) impurities have been made in the temperature range 1.3-21.9ifmmode^circelsetextdegreefi{}K. The experiments in the solid were carried out at two radio frequencies, ensuremath{sim}10 and ensuremath{sim}40 MHz, on samples whose ortho-${mathrm{H}}_{2}$ concentration had been greatly reduced by ortho-para conversion for several weeks at 4.2ifmmode^circelsetextdegreefi{}K. Below 8ifmmode^circelsetextdegreefi{}K, ${T}_{1}$ is strongly temperature-dependent, varying roughly as ${T}^{ensuremath{-}6.5}$ down to 4ifmmode^circelsetextdegreefi{}K in the samples with lowest ortho-${mathrm{H}}_{2}$ concentration. Below 4ifmmode^circelsetextdegreefi{}K, the temperature dependence decreases to about ${T}^{ensuremath{-}2}$ at 2ifmmode^circelsetextdegreefi{}K. The magnetic field dependence of ${T}_{1}$ between 0.5 and 10 kOe, at liquid-helium temperatures, is found to have the approximate form ${T}_{1}ensuremath{propto}{H}^{ensuremath{alpha}}$, with $ensuremath{alpha}$ between $frac{1}{3}$ and 1. These low-temperature results are interpreted in terms of a fast cross-relaxation process between protons of different species, which gives a relaxation rate $frac{1}{{T}_{1}}$ proportional to the product of the ortho-${mathrm{H}}_{2}$ relaxation rate and the ortho-${mathrm{H}}_{2}$ concentration. Differences between our results and those of Hardy and Gaines are explained by a quenching in our samples of relaxation processes involving mutual interactions of ortho-${mathrm{H}}_{2}$ molecules, apparently as a result of crystal-field splittings of the rotational levels produced by the appreciable para-${mathrm{H}}_{2}$ (and perhaps ${mathrm{D}}_{2}$) impurity concentrations in our samples. We were able to deduce the ortho-${mathrm{H}}_{2}$ concentrations of our samples (between 7 ifmmodetimeselsetexttimesfi{} ${10}^{ensuremath{-}4}$ and 6 ifmmodetimeselsetexttimesfi{} ${10}^{ensuremath{-}7}$), to determine the intrinsic relaxation time of the ortho-${mathrm{H}}_{2}$ impurity, which is approximately 16 msec at 4.2ifmmode^circelsetextdegreefi{}K and 2.5 kOe, and to resolve some of the problems in Hardy and Gaines's interpretation. In the temperature region above ensuremath{sim}8ifmmode^circelsetextdegreefi{}K for the solid substance, self-diffusion-induced relaxation becomes important for our range of sample ortho-${mathrm{H}}_{2}$ concentrations, and the results are in semiquantitative agreement with the predictions of Bloom's theory. In particular, near the melting point, ${T}_{1}$ is independent of the ortho-${mathrm{H}}_{2}$ concentration, indicating dominance of an intrinsic HD relaxation mechanism, and ${T}_{1}$ is proportional to ${H}^{2}$. The activation energy for HD molecular self-diffusion was found to be approximately 190ifmmode^circelsetextdegreefi{}K, which is considerably lower than the value of 302ifmmode^circelsetextdegreefi{}K previously determined by Bloom. The rate of ortho-para conversion of ${mathrm{H}}_{2}$ in solid HD was measured to be (0.68ifmmodepmelsetextpmfi{}0.05)%/h, in reasonable agreement with theoretical calculations by Urano and Motizuki. Measurements were also made on the rate of para-ortho relaxation at room temperature in a glass vessel, by monitoring the relaxation time at 4.2ifmmode^circelsetextdegreefi{}K after various waiting times at room temperature. Proton ${T}_{1}$ measurements in the liquid at 5.9 MHz indicate an increase of ${T}_{1}$ with temperature. From these measurements, the relative relaxation rates due to translational and rotational processes are shown to vary from about 4:1 at the HD boiling point to 50:1 at the melting point, in agreement with Bloom's estimate." @default.
• W1969206507 created "2016-06-24" @default.
• W1969206507 creator A5017064034 @default.
• W1969206507 creator A5073423743 @default.
• W1969206507 creator A5091837259 @default.
• W1969206507 date "1968-05-10" @default.
• W1969206507 modified "2023-09-27" @default.
• W1969206507 title "Proton Spin-Lattice Relaxation in Solid and Liquid Hydrogen Deuteride" @default.
• W1969206507 cites W1551616891 @default.
• W1969206507 cites W1658364917 @default.
• W1969206507 cites W1680325820 @default.
• W1969206507 cites W1967901059 @default.
• W1969206507 cites W1975561388 @default.
• W1969206507 cites W1983008237 @default.
• W1969206507 cites W1985028958 @default.
• W1969206507 cites W1996847462 @default.
• W1969206507 cites W1997498678 @default.
• W1969206507 cites W1999387036 @default.
• W1969206507 cites W1999549793 @default.
• W1969206507 cites W2007128587 @default.
• W1969206507 cites W2007547610 @default.
• W1969206507 cites W2016631851 @default.
• W1969206507 cites W2022042286 @default.
• W1969206507 cites W2022662010 @default.
• W1969206507 cites W2024066686 @default.
• W1969206507 cites W2043180960 @default.
• W1969206507 cites W2059622532 @default.
• W1969206507 cites W2109100255 @default.
• W1969206507 cites W2131904845 @default.
• W1969206507 cites W2314811535 @default.
• W1969206507 cites W2329618623 @default.
• W1969206507 doi "https://doi.org/10.1103/physrev.169.299" @default.
• W1969206507 hasPublicationYear "1968" @default.
• W1969206507 type Work @default.
• W1969206507 sameAs 1969206507 @default.
• W1969206507 citedByCount "20" @default.
• W1969206507 crossrefType "journal-article" @default.
• W1969206507 hasAuthorship W1969206507A5017064034 @default.
• W1969206507 hasAuthorship W1969206507A5073423743 @default.
• W1969206507 hasAuthorship W1969206507A5091837259 @default.
• W1969206507 hasConcept C121332964 @default.
• W1969206507 hasConcept C150077920 @default.
• W1969206507 hasConcept C15744967 @default.
• W1969206507 hasConcept C184779094 @default.
• W1969206507 hasConcept C185544564 @default.
• W1969206507 hasConcept C24890656 @default.
• W1969206507 hasConcept C26873012 @default.
• W1969206507 hasConcept C2776029896 @default.
• W1969206507 hasConcept C2781204021 @default.
• W1969206507 hasConcept C36703968 @default.
• W1969206507 hasConcept C39353612 @default.
• W1969206507 hasConcept C46141821 @default.
• W1969206507 hasConcept C54516573 @default.
• W1969206507 hasConcept C77805123 @default.
• W1969206507 hasConcept C97355855 @default.
• W1969206507 hasConceptScore W1969206507C121332964 @default.
• W1969206507 hasConceptScore W1969206507C150077920 @default.
• W1969206507 hasConceptScore W1969206507C15744967 @default.
• W1969206507 hasConceptScore W1969206507C184779094 @default.
• W1969206507 hasConceptScore W1969206507C185544564 @default.
• W1969206507 hasConceptScore W1969206507C24890656 @default.
• W1969206507 hasConceptScore W1969206507C26873012 @default.
• W1969206507 hasConceptScore W1969206507C2776029896 @default.
• W1969206507 hasConceptScore W1969206507C2781204021 @default.
• W1969206507 hasConceptScore W1969206507C36703968 @default.
• W1969206507 hasConceptScore W1969206507C39353612 @default.
• W1969206507 hasConceptScore W1969206507C46141821 @default.
• W1969206507 hasConceptScore W1969206507C54516573 @default.
• W1969206507 hasConceptScore W1969206507C77805123 @default.
• W1969206507 hasConceptScore W1969206507C97355855 @default.
• W1969206507 hasIssue "2" @default.
• W1969206507 hasLocation W19692065071 @default.
• W1969206507 hasOpenAccess W1969206507 @default.
• W1969206507 hasPrimaryLocation W19692065071 @default.
• W1969206507 hasRelatedWork W1973890312 @default.
• W1969206507 hasRelatedWork W1973895505 @default.
• W1969206507 hasRelatedWork W1978874190 @default.
• W1969206507 hasRelatedWork W1979911607 @default.
• W1969206507 hasRelatedWork W1984190371 @default.
• W1969206507 hasRelatedWork W2005261873 @default.
• W1969206507 hasRelatedWork W2021447094 @default.
• W1969206507 hasRelatedWork W2056236589 @default.
• W1969206507 hasRelatedWork W2396460842 @default.
• W1969206507 hasRelatedWork W2071498061 @default.
• W1969206507 hasVolume "169" @default.
• W1969206507 isParatext "false" @default.
• W1969206507 isRetracted "false" @default.
• W1969206507 magId "1969206507" @default.
• W1969206507 workType "article" @default.