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Nitrogen ions are detected as a REMPI signal and its spectra depending on the wavelength of an irradiated laser beam are analyzed to measure rotational temperature through the Boltzmann plot. Nitrogen gas expands into a vacuum chamber from a sonic nozzle with a D=0.50 mm diameter, setting PoD (Po:source pressure), depending inversely on the nozzle Knudsen number, at 15 Torr\u30fbmm or lower. For PoD=15 Torr\u30fbmm, the rotational temperature distribution along the centerline of the jet, measured by Boltzmann plot, coincides with Marrone\u0027s data measured by electron beam fluorescence, and the rotational relaxation rate Z_R calculated by the relaxation equation results is 1.3. However, the non-Boltzmann rotational distribution appears evidently in the supersonic free molecular nitrogen flows for PoD\u226415 Torr\u30fbmm and as a decrease in the PoD, the deviation from the Boltzmann distribution and the partial freezing of the population arise more upstream.", "subitem_description_type": "Abstract"}]}, "item_10_identifier_60": {"attribute_name": "URI", "attribute_value_mlt": [{"subitem_identifier_type": "HDL", "subitem_identifier_uri": "http://hdl.handle.net/2237/9017"}]}, "item_10_publisher_32": {"attribute_name": "\u51fa\u7248\u8005", "attribute_value_mlt": [{"subitem_publisher": "\u65e5\u672c\u6a5f\u68b0\u5b66\u4f1a"}]}, "item_10_relation_43": {"attribute_name": "\u7570\u7248\u3067\u3042\u308b", "attribute_value_mlt": [{"subitem_relation_type": "isVersionOf", "subitem_relation_type_id": {"subitem_relation_type_id_text": "http://ci.nii.ac.jp/naid/110005051421/", "subitem_relation_type_select": "URI"}}]}, "item_10_rights_12": {"attribute_name": 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