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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">dan</journal-id><journal-title-group><journal-title xml:lang="ru">Доклады Национальной академии наук Беларуси</journal-title><trans-title-group xml:lang="en"><trans-title>Doklady of the National Academy of Sciences of Belarus</trans-title></trans-title-group></journal-title-group><issn pub-type="ppub">1561-8323</issn><issn pub-type="epub">2524-2431</issn><publisher><publisher-name>The Republican Unitary Enterprise Publishing House "Belaruskaya Navuka"</publisher-name></publisher></journal-meta><article-meta><article-id custom-type="elpub" pub-id-type="custom">dan-457</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>ФИЗИКА</subject></subj-group><subj-group subj-group-type="section-heading" xml:lang="en"><subject>PHYSICS</subject></subj-group></article-categories><title-group><article-title>ПОЛОЖЕНИЕ ЧАСТОТЫ 0–0-ПЕРЕХОДА В ДИФФУЗНОМ ЭЛЕКТРОННО-КОЛЕБАТЕЛЬНОМ СПЕКТРЕ</article-title><trans-title-group xml:lang="en"><trans-title>LOCALIZATION OF THE 0–0-TRANSITION IN DIFFUSE VIBRONIC SPECTRA</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>Толкачев</surname><given-names>В. А.</given-names></name><name name-style="western" xml:lang="en"><surname>Tolkachev</surname><given-names>V. A.</given-names></name></name-alternatives><bio xml:lang="ru"><p>академик, д-р физ.- мат. наук, профессор, гл. науч. сотрудник</p><p>пр. Независимости, 68, 220072</p></bio><bio xml:lang="en"><p>Academician, D. Sc. (Physics and Mathematics), Professor, Chief researcher</p><p>68, Nezavisimosti Ave., 220072</p></bio><email xlink:type="simple">tolkachev@imaph.bas-net.by</email><xref ref-type="aff" rid="aff-1"/></contrib></contrib-group><aff-alternatives id="aff-1"><aff xml:lang="ru"><institution>Институт физики им. Б. И. Степанова Национальной академии наук Беларуси, Минск</institution></aff><aff xml:lang="en"><institution>B. I. Stepanov Institute of Physics of the National Academy of Sciences of Belarus, Minsk</institution></aff></aff-alternatives><pub-date pub-type="collection"><year>2017</year></pub-date><pub-date pub-type="epub"><day>17</day><month>12</month><year>2017</year></pub-date><volume>61</volume><issue>5</issue><fpage>50</fpage><lpage>55</lpage><permissions><copyright-statement>Copyright &amp;#x00A9; Толкачев В.А., 2017</copyright-statement><copyright-year>2017</copyright-year><copyright-holder xml:lang="ru">Толкачев В.А.</copyright-holder><copyright-holder xml:lang="en">Tolkachev V.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://doklady.belnauka.by/jour/article/view/457">https://doklady.belnauka.by/jour/article/view/457</self-uri><abstract><p>Тождественностью вероятностей прямого и обратного вертикальных оптических переходов между двумя элементарными франк-кондоновскими состояниями обосновывается возможность установления положения частоты чисто электронного перехода ν0 по диффузным спектрам поглощения, флуоресценции или фосфоресценции молекул. В такой модели при термически равновесном начальном для электронно-колебательного перехода состоянии сечения переходов σ ν( ) удовлетворяют условию ( ( ) / )exp( / (2 )) (| |) σ ν ν ν =ϕ ν−ν h kT 0 («–» – поглощение, «+» – испускание, ϕ – зеркальная относительно ν0 функция), но лишь в стоксовых областях: для ν&gt;ν0 в поглощении и ν&lt;ν0 в испускании. Приводятся примеры определения 0–0-перехода из диффузных спектров по экстремуму ϕ ν( ) и сравнение с точными, определенными при струйном охлаждении. Частота 0–0-перехода для бесструктурного диффузного спектра, как правило, существенно отличается от частоты максимума спектра. Уширение области экстремума ϕ ν( ) характеризует неоднородность уширения спектра.</p></abstract><trans-abstract xml:lang="en"><p>The feasibility of determination of the 0–0-electronic transition ν0 for diffuse absorption, fluorescence and phosphorescence spectra is proposed on the basic principle: direct and reverse transition probabilities between two elemental molecular states are identical. For the starting state being in thermal equilibrium, the transition cross-sections σ obey the relation ( ( ) / )exp( / (2 )) (| |), σ ν ν ν =ϕ ν−ν h kT 0 ϕ is the mirror function about ν0 with «–» and ν&gt;ν0 for absorption, «+» and ν&lt;ν0 for emission respectively. Examples are given of ν0 determined as the extremum of ϕ ν( ) in comparison to the jet-cool spectroscopy data. As a rule, ν0 differs from the maximum of spectra ( ). ν max The width of the area of the extremum of ϕ ν( ) characterizes the inhomogeneity of the spectra.</p></trans-abstract><kwd-group xml:lang="ru"><kwd>частота 0–0-перехода</kwd><kwd>диффузные спектры</kwd><kwd>чисто электронный переход</kwd><kwd>проявление таутомерии</kwd><kwd>неоднородность уширения</kwd></kwd-group><kwd-group xml:lang="en"><kwd>0–0-transition</kwd><kwd>diffuse spectra</kwd><kwd>electronic transition</kwd><kwd>manifestation of tautomerizm</kwd><kwd>inhomogeneous broadening</kwd></kwd-group><funding-group><funding-statement xml:lang="ru">Работа выполнена при поддержке БРФФИ (проекты Ф16-103 и Ф16К-051).</funding-statement><funding-statement xml:lang="en">The work is sponsored by the Belarusian Republican Foundation for Fundamental Research (Projects Ф16-103 and Ф16К-051).</funding-statement></funding-group></article-meta></front><back><ref-list><title>References</title><ref id="cit1"><label>1</label><citation-alternatives><mixed-citation xml:lang="ru">Казаченко, Л. 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