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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-1417</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>МОЛЕКУЛЯРНАЯ СПЕКТРОСКОПИЯ</subject></subj-group><subj-group subj-group-type="section-heading" xml:lang="en"><subject>MOLECULAR SPECTROSCOPY</subject></subj-group></article-categories><title-group><article-title>Фотофизические процессы в молекулах индола в этаноле при 77 К при возбуждении на длинноволновом крае спектра поглощения</article-title><trans-title-group xml:lang="en"><trans-title>Photophysical Processes in Indole Molecules in Ethanol at 77 K Upon Excitation at the Long Wavelength Edge of the Absorption Spectrum</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>Суходола</surname><given-names>А. А.</given-names></name><name name-style="western" xml:lang="en"><surname>Sukhodola</surname><given-names>A. A.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Минск</p></bio><bio xml:lang="en"><p>Minsk</p></bio><email xlink:type="simple">a.sukhodola@bntu.by</email><xref ref-type="aff" rid="aff-1"/></contrib></contrib-group><aff-alternatives id="aff-1"><aff xml:lang="ru"><institution>Белорусский национальный технический университет</institution></aff><aff xml:lang="en"><institution>Belarusian National Technical University</institution></aff></aff-alternatives><pub-date pub-type="collection"><year>2023</year></pub-date><pub-date pub-type="epub"><day>25</day><month>11</month><year>2023</year></pub-date><volume>90</volume><issue>5</issue><fpage>754</fpage><lpage>759</lpage><permissions><copyright-statement>Copyright &amp;#x00A9; Суходола А.А., 2023</copyright-statement><copyright-year>2023</copyright-year><copyright-holder xml:lang="ru">Суходола А.А.</copyright-holder><copyright-holder xml:lang="en">Sukhodola A.A.</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/1417">https://zhps.ejournal.by/jour/article/view/1417</self-uri><abstract><p>Исследована зависимость спектров люминесценции раствора индола в этаноле при 77 К от длины волны возбуждающего излучения. Обнаружено уменьшение отношения интенсивностей фосфоресценции и флуоресценции при возбуждении молекул индола на длинноволновом крае спектра поглощения. Установлено, что этот эффект связан с уменьшением отношения квантовых выходов интеркомбинационной конверсии и флуоресценции. Сделан вывод об увеличении вклада уровня 1La в процессы релаксации возбужденного синглетного состояния. Время жизни триплетных состояний не зависит от длины волны возбуждающего излучения.</p></abstract><trans-abstract xml:lang="en"><p>The dependence of the luminescence spectra of an indole solution in ethanol at 77 K on the excitation wavelength has been studied. A decrease in the ratio of the intensities of phosphorescence and fluorescence has been found upon excitation of indole molecules at the long-wavelength edge of the absorption spectrum. It has been found that this effect is associated with a decrease in the ratio of the quantum yields of the intercombination conversion and fluorescence. It is concluded that the contribution of 1La level to the processes of relaxation of the excited singlet state increases. The lifetime of triplet states does not depend on the wavelength of the exciting radiation.</p></trans-abstract><kwd-group xml:lang="ru"><kwd>индол</kwd><kwd>спектры поглощения</kwd><kwd>флуоресценция</kwd><kwd>фосфоресценция</kwd><kwd>интеркомбинационная конверсия</kwd><kwd>триплетные состояния</kwd></kwd-group><kwd-group xml:lang="en"><kwd>indole</kwd><kwd>absorption spectra</kwd><kwd>fluorescence</kwd><kwd>phosphorescence</kwd><kwd>intercombination conversion</kwd><kwd>triplet states</kwd></kwd-group></article-meta></front><back><ref-list><title>References</title><ref id="cit1"><label>1</label><citation-alternatives><mixed-citation xml:lang="ru">A. P. Demchenko. Ultraviolet Spectroscopy of Proteins, Springer, Berlin (1986)</mixed-citation><mixed-citation xml:lang="en">A. P. Demchenko. 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