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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-1815</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>ПРИБОРЫ И МЕТОДЫ СПЕКТРОСКОПИИ</subject></subj-group><subj-group subj-group-type="section-heading" xml:lang="en"><subject>DEVICES AND METHODS OF SPECTROSCOPY</subject></subj-group></article-categories><title-group><article-title>Использование аппарата производящих функционалов для анализа потоков фотоотсчетов в системах одноквантовой регистрации интенсивности флуоресценции</article-title><trans-title-group xml:lang="en"><trans-title>Using a Probability Generating Functional for Analysis of Photon Arrival Processes in Single-Quantum Registration Systems of Fluorescence Intensity</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>Скакун</surname><given-names>В. В.</given-names></name><name name-style="western" xml:lang="en"><surname>Skakun</surname><given-names>V. V.</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">skakun@bsu.by</email><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Апанасович</surname><given-names>В. В.</given-names></name><name name-style="western" xml:lang="en"><surname>Apanasovich</surname><given-names>V. V.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Минск</p></bio><bio xml:lang="en"><p>Minsk</p></bio><xref ref-type="aff" rid="aff-1"/></contrib></contrib-group><aff-alternatives id="aff-1"><aff xml:lang="ru"><institution>Белорусский государственный университет</institution></aff><aff xml:lang="en"><institution>Belarusian State University</institution></aff></aff-alternatives><pub-date pub-type="collection"><year>2025</year></pub-date><pub-date pub-type="epub"><day>27</day><month>03</month><year>2025</year></pub-date><volume>92</volume><issue>2</issue><fpage>235</fpage><lpage>245</lpage><permissions><copyright-statement>Copyright &amp;#x00A9; Скакун В.В., Апанасович В.В., 2025</copyright-statement><copyright-year>2025</copyright-year><copyright-holder xml:lang="ru">Скакун В.В., Апанасович В.В.</copyright-holder><copyright-holder xml:lang="en">Skakun V.V., Apanasovich V.V.</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/1815">https://zhps.ejournal.by/jour/article/view/1815</self-uri><abstract><p>Получено выражение для производящего функционала потока фотоотсчетов в системах флуоресцентной флуктуационой спектроскопии в предположении произвольной интенсивности флуоресценции на интервале наблюдения. Использование производящих функционалов обобщает теорию методов анализа распределений числа фотоотсчетов, основанных на применении производящих функций числа событий, и открывает возможность анализа систем с нестационарной интенсивностью на интервале наблюдения. Найдены выражения для интенсивности потока и вероятности регистрации определенного числа фотоотсчетов на интервале наблюдения. На основе полученных выражений разработан метод оценки концентрации флуоресцирующих молекул с произвольной интенсивностью флуоресценции. Метод применим для однофотонного и двухфотонного возбуждения и не зависим от вида функции засветки.</p></abstract><trans-abstract xml:lang="en"><p>An expression is obtained for the probability generating functional of the photon arrival processes in fluorescence fluctuation spectroscopy systems under the assumption of an arbitrary fluorescence intensity over the observation interval. The use of generating functionals generalizes the theory of photon counting distribution analysis methods based on the application of photon counts generating functions and opens up the possibility of analyzing the systems with non-stationary intensity over the observation interval. Expressions are found for the process intensity and the probability to obtain a certain number of photocounts per observation interval. Based on the obtained expressions, a method for estimating the concentration of fluorescent molecules with an arbitrary fluorescence intensity is developed. The method is applicable for both single-photon and two-photon excitation and does not depend on the form of the brightness profile function.</p></trans-abstract><kwd-group xml:lang="ru"><kwd>флуоресцентная флуктуационная спектроскопия</kwd><kwd>производящий функционал</kwd><kwd>потоки случайных событий</kwd><kwd>методы анализа распределения числа фотоотсчетов</kwd></kwd-group><kwd-group xml:lang="en"><kwd>fluorescence fluctuation spectroscopy</kwd><kwd>probability generating functional</kwd><kwd>random point processes</kwd><kwd>methods of photon counting histogram analysis</kwd></kwd-group><funding-group><funding-statement xml:lang="ru">Авторы благодарят Центр микроскопии университета Вагенингена (Вагенинген, Нидерланды) и Dr. Jan Willem Borst за предоставление результатов измерения Rho110 в буфере.</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">E. 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