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<article article-type="research-article" dtd-version="1.3" xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xml:lang="ru"><front><journal-meta><journal-id journal-id-type="publisher-id">zhps</journal-id><journal-title-group><journal-title xml:lang="ru">Журнал прикладной спектроскопии</journal-title><trans-title-group xml:lang="en"><trans-title>Zhurnal Prikladnoii Spektroskopii</trans-title></trans-title-group></journal-title-group><issn pub-type="ppub">0514-7506</issn><publisher><publisher-name>B. I. Stepanov Institute of Physics of the National Academy of Sciences</publisher-name></publisher></journal-meta><article-meta><article-id custom-type="elpub" pub-id-type="custom">zhps-794</article-id><article-categories><subj-group subj-group-type="heading"><subject>Research Article</subject></subj-group><subj-group subj-group-type="section-heading" xml:lang="ru"><subject>Статьи</subject></subj-group></article-categories><title-group><article-title>Измерения и расчет во втором порядке теории возмущений столкновительных параметров ИК-линий PН3 в водороде</article-title><trans-title-group xml:lang="en"><trans-title>Infrared Line Collisional Parameters of PН3 in Hydrogen: Measurements with Second-Order Approximation of Perturbation Theory</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Salem</surname><given-names>J.</given-names></name><name name-style="western" xml:lang="en"><surname>Salem</surname><given-names>J.</given-names></name></name-alternatives><bio xml:lang="ru"><p>2112 Гафса.</p></bio><bio xml:lang="en"><p>2112 Gafsa.</p></bio><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Charguia</surname><given-names>R.</given-names></name><name name-style="western" xml:lang="en"><surname>Charguia</surname><given-names>R.</given-names></name></name-alternatives><bio xml:lang="ru"><p>1060 Тунис.</p></bio><bio xml:lang="en"><p>1060 Tunis.</p></bio><email xlink:type="simple">charguiaraihen@yahoo.fr</email><xref ref-type="aff" rid="aff-2"/></contrib><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Ben Younes</surname><given-names>R.</given-names></name><name name-style="western" xml:lang="en"><surname>Ben Younes</surname><given-names>R.</given-names></name></name-alternatives><bio xml:lang="ru"><p>2112 Гафса.</p></bio><bio xml:lang="en"><p>2112 Gafsa.</p></bio><xref ref-type="aff" rid="aff-1"/></contrib></contrib-group><aff-alternatives id="aff-1"><aff xml:lang="ru"><institution>Университет Сиди Ахмед Зарруга</institution></aff><aff xml:lang="en"><institution>Laboratoire Technologie Energie et Materiaux Innovants TEMI, Faculte des Sciences de Gafsa, Campus Universitaire Sidi Ahmed Zarroug</institution></aff></aff-alternatives><aff-alternatives id="aff-2"><aff xml:lang="ru"><institution>Колледж наук и искусств Бурайды Университета Кассима; Тунисский университет Эль-Манар</institution></aff><aff xml:lang="en"><institution>Department of Physics, College of Sciences and Arts at Buraydah, Qassim University; Condensed Matter Physics Laboratory, Physics Department, Faculty of Sciences of Tunis, University of Tunis El Manar</institution></aff></aff-alternatives><pub-date pub-type="collection"><year>2021</year></pub-date><pub-date pub-type="epub"><day>28</day><month>05</month><year>2021</year></pub-date><volume>88</volume><issue>3</issue><fpage>351</fpage><lpage>359</lpage><permissions><copyright-statement>Copyright &amp;#x00A9; Salem J., Charguia R., ben Younes R., 2021</copyright-statement><copyright-year>2021</copyright-year><copyright-holder xml:lang="ru">Salem J., Charguia R., ben Younes R.</copyright-holder><copyright-holder xml:lang="en">Salem J., Charguia R., ben Younes R.</copyright-holder><license xml:lang="ru" license-type="creative-commons-attribution" xlink:href="https://creativecommons.org/licenses/by/4.0/" xlink:type="simple"><license-p>Данная работа распространяется под лицензией Creative Commons Attribution 4.0.</license-p></license><license xml:lang="en" license-type="creative-commons-attribution" xlink:href="https://creativecommons.org/licenses/by/4.0/" xlink:type="simple"><license-p>This work is licensed under a Creative Commons Attribution 4.0 License.</license-p></license></permissions><self-uri xlink:href="https://zhps.ejournal.by/jour/article/view/794">https://zhps.ejournal.by/jour/article/view/794</self-uri><abstract><p>Поглощение при комнатной температуре смесями PH3-H2 в полосах ν2 и ν4 фосфина (PH3) измерено для низких давлений. Подбор спектров выполняется для определения ширины изолированных линий и смешивания линий в приближении Розенкранца первого порядка. В приближении Розенкранца первого порядка параметры столкновения считаются линейными с давлением. Зарегистрированы спектры для трех дублетов: линии A1 и A2 в полосах ν2 и ν4 PH3, разбавленного H2 более высокого давления. Показано, что сдвиги линий не линейны в зависимости от возмущающего давления. Это требует проверки соответствия записанных спектров профилям, полученным во втором порядке теории возмущений. Определяются и обсуждаются коэффициенты смешивания первого и второго порядка. Показано, что изменение распределения интенсивности обеспечивается обменом населенностью между низкими энергетическими уровнями для компонентов дублетов A1 и A2 и описывается с помощью параметра смешения второго порядка. Таким образом смешивание влияет на ширину линии.</p></abstract><trans-abstract xml:lang="en"><p>Room-temperature absorption by PH3-H2 mixtures in the ν2 and ν4 bands of phosphine (PH3) has been measured for low pressures. Fits of these spectra are made to determine the width of isolated lines and line mixing in a first-order Rosenkranz approximation. From the previous determinations, we deduce remarks on the lack of accuracy of predicting the collisional process. With the first-order Rosenkranz approximation, the collisional parameters are considered linear with pressure. In this work, we have considered spectra recorded for three doublets: A1 and A2 lines in the ν2 and ν4 bands of PH3 diluted with higher H2 pressure. We show that the line shifts are non-linear with perturber pressures, which requires testing the fits of the recorded spectra with profiles developed in the second-order approximation of the perturbation theory. Consequently, the first- and second-order mixing coefficients are determined and discussed. Throughout this study, we also show that the change in the intensity distribution is provided by the population exchange between low energy levels for the two components of doublets A1 and A2 lines and is described through the second-order mixing parameter. Thereby, we show the mixing effect on line width.</p></trans-abstract><kwd-group xml:lang="ru"><kwd>приближение Розенкранца первого порядка</kwd><kwd>приближение второго порядка</kwd><kwd>теория возмущений</kwd></kwd-group><kwd-group xml:lang="en"><kwd>first-order Rosenkranz approximation</kwd><kwd>second-order approximation</kwd><kwd>perturbation theory</kwd></kwd-group><funding-group><funding-statement xml:lang="en">The authors J. Salem and R. 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