λAnomaly in the Heat Capacity of Solid Hydrogen at Small Molar Volumes

Autor:	G. Ahlers, W. H. Orttung
Rok vydání:	1964
Předmět:	Physics Dipole Hydrogen chemistry Solid hydrogen Quadrupole Intermolecular force Exponent General Physics and Astronomy Thermodynamics chemistry.chemical_element Lambda Heat capacity
Zdroj:	Physical Review. 133:A1642-A1650
ISSN:	0031-899X
DOI:	10.1103/physrev.133.a1642
Popis:	Apparatus for the determination of properties of solid hydrogen at volumes between 15 and 23 cc/mole is described. The results of measurements on the $\ensuremath{\lambda}$ anomaly in the heat capacity of solid hydrogen containing large concentrations of orthohydrogen are reported for molar volumes from 15.8 to 22.6 cc. The $\ensuremath{\lambda}$ temperature was found to vary with intermolecular separation $R$ as ${R}^{\ensuremath{-}5}$, with a small contribution from a higher exponent. This is in agreement with the expected relative contributions of electric quadrupole and valence interactions to the intermolecular potential. The relative contribution of the $\ensuremath{\lambda}$ anomaly to the total anomalous entropy was estimated. The $\ensuremath{\lambda}$ anomaly was found to have at least two distinct peaks.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::44cdc45a6cb077e01fed6db1602477ad https://doi.org/10.1103/physrev.133.a1642 Zobrazit plný text záznamu