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Novel data regarding emitted spectral lines of excited helium atoms and ions in the 20\u201333\u2009nm wavelength range and their intensity behavior with variation of discharge operational conditions are presented. The intensity of all the spectral emissions was found to strongly increase with the microwave power delivered to the plasma. Furthermore, the intensity of the ionic spectral emissions decreases by nearly one order of magnitude as the pressure was raised from 0.2 to 0.5 mbar.<\/jats:p>","DOI":"10.1063\/1.4954850","type":"journal-article","created":{"date-parts":[[2016,6,29]],"date-time":"2016-06-29T21:51:52Z","timestamp":1467237112000},"update-policy":"https:\/\/doi.org\/10.1063\/aip-crossmark-policy-page","source":"Crossref","is-referenced-by-count":6,"title":["Extreme ultraviolet radiation emitted by helium microwave driven plasmas"],"prefix":"10.1063","volume":"119","author":[{"given":"S.","family":"Espinho","sequence":"first","affiliation":[{"name":"Universidade de Lisboa Instituto de Plasmas e Fus\u00e3o Nuclear, Instituto Superior T\u00e9cnico, , 1049-001 Lisboa, Portugal"}]},{"given":"E.","family":"Felizardo","sequence":"additional","affiliation":[{"name":"Universidade de Lisboa Instituto de Plasmas e Fus\u00e3o Nuclear, Instituto Superior T\u00e9cnico, , 1049-001 Lisboa, Portugal"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-9444-0159","authenticated-orcid":false,"given":"E.","family":"Tatarova","sequence":"additional","affiliation":[{"name":"Universidade de Lisboa Instituto de Plasmas e Fus\u00e3o Nuclear, Instituto Superior T\u00e9cnico, , 1049-001 Lisboa, Portugal"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-2677-574X","authenticated-orcid":false,"given":"L. 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