{"title":"TOF系统中e+和e -光束能量宽度的窄化方法","authors":"O. Sueoka, M. Yamazaki","doi":"10.1088/0022-3735/22/10/010","DOIUrl":null,"url":null,"abstract":"A method for narrowing the energy width of e+ and e- beams using a 22Na radio-isotope and a W moderator is developed. The method provides a width of about 1 eV for 10-20 eV beams, and is applied to inelastic scattering measurements on the Schumann-Runge excitation of an O2 molecule by e+ and e- impact. The ratio of the excitation cross section in O2 by e+ impact to that by e- is about 1.2 for impact energies in the range 13-22 eV.","PeriodicalId":16791,"journal":{"name":"Journal of Physics E: Scientific Instruments","volume":"13 1","pages":"852-855"},"PeriodicalIF":0.0000,"publicationDate":"1989-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"1","resultStr":"{\"title\":\"Method for narrowing energy width of e+ and e− beams in a TOF system\",\"authors\":\"O. Sueoka, M. Yamazaki\",\"doi\":\"10.1088/0022-3735/22/10/010\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"A method for narrowing the energy width of e+ and e- beams using a 22Na radio-isotope and a W moderator is developed. The method provides a width of about 1 eV for 10-20 eV beams, and is applied to inelastic scattering measurements on the Schumann-Runge excitation of an O2 molecule by e+ and e- impact. The ratio of the excitation cross section in O2 by e+ impact to that by e- is about 1.2 for impact energies in the range 13-22 eV.\",\"PeriodicalId\":16791,\"journal\":{\"name\":\"Journal of Physics E: Scientific Instruments\",\"volume\":\"13 1\",\"pages\":\"852-855\"},\"PeriodicalIF\":0.0000,\"publicationDate\":\"1989-10-01\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"1\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Journal of Physics E: Scientific Instruments\",\"FirstCategoryId\":\"1085\",\"ListUrlMain\":\"https://doi.org/10.1088/0022-3735/22/10/010\",\"RegionNum\":0,\"RegionCategory\":null,\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"\",\"JCRName\":\"\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Journal of Physics E: Scientific Instruments","FirstCategoryId":"1085","ListUrlMain":"https://doi.org/10.1088/0022-3735/22/10/010","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
Method for narrowing energy width of e+ and e− beams in a TOF system
A method for narrowing the energy width of e+ and e- beams using a 22Na radio-isotope and a W moderator is developed. The method provides a width of about 1 eV for 10-20 eV beams, and is applied to inelastic scattering measurements on the Schumann-Runge excitation of an O2 molecule by e+ and e- impact. The ratio of the excitation cross section in O2 by e+ impact to that by e- is about 1.2 for impact energies in the range 13-22 eV.
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