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dc.creatorRao, D. Ramachandraen_US
dc.creatorOka, T.en_US
dc.date.accessioned2006-06-15T14:36:29Z
dc.date.available2006-06-15T14:36:29Z
dc.date.issued1980en_US
dc.identifier1980-TH-1en_US
dc.identifier.urihttp://hdl.handle.net/1811/11431
dc.descriptionAuthor Institution:en_US
dc.description.abstractIt is expected theoretically that a hydrogen molecule in the J=0 rotational level would behave differently as a collision partner from those in the other rotational levels. This is because it effectively does not possess a quadrupole moment and thus does not exert a long range force. In order to demonstrate this point experimentally, the pressure broadening of the $\nu_{1}$ band of $NH_{3}$ by $H_{2}$ has been measured using a difference frequency laser system. The difference in the percentage of the J=0 $H_{2}$ in normal-$H_{2}$ and para-$H_{2}$ (18.4% versus 73.2% at dry ice temperature) was exploited to distinguish the effect of the J=0 $H_{2}$ from that of the rest. The measurement, has shown that the normal-$H_{2}$ is more effective as a perturber than the para-$H_{2}$ by a factor or $1.29\pm 0.03$ at dry ice temperature. Using the simple assumption that all $J\neq0 H_{2}$ has the same collision cross section, it was found that $\sigma(J\neq 0)$ is larger than $\sigma (J=0)$ by about 60%. The variation of $\sigma(J=0)$ and $\sigma(J\neq0) - \sigma(J=0)$ with temperature has also been determined. The astrophysical implications of the result will be discussed.en_US
dc.format.extent104610 bytes
dc.format.mimetypeimage/jpeg
dc.language.isoEnglishen_US
dc.publisherOhio State Universityen_US
dc.titleTHE J=0 HYDROGEN MOLECULE AS A COLLISION PARTNERen_US
dc.typearticleen_US


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