Solid state topochemical photopolymerization of amphiphilic diynes modified at hydrophobic part of molecule was under the study. All compounds formed stable monomer monolayers on an aqueous subphase surface and were transferred as multilayers onto quartz substrates by the Langmuir‐Blodgett technique. The changes of the multilayer absorption spectra as a function of UV irradiation time have been investigated. It is shown that the insertion of an ester or sulfonyl group into the hydrophobic part of the diyne molecule increased their activity in topochemical photopolymerization reaction. The polymer absorbancies decreased under excess UV irradiation due to the decomposition of polydiacetylenic chains in the multilayer structure.

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Институт теоретической и прикладной электродинамики Российской академии наук, 125412, Москва, ул. Ижорская, д.13 Статья поступила в редакцию 6 ноября 2019 г. Аннотация. В работе рассмотрено влияние выноса облучателя коллиматора из фокуса на неравномерность фазы поля в рабочей зоне компактного полигона. Проведена численная оценка поля в рабочей зоне, рассмотрено два способа расчета-в геометрооптическом приближении и методом физической оптики. Проведено сравнение этих методов. Также были проведены измерения неравномерности поля в рабочей зоне компактного полигона при смещении облучателя относительно фокуса зеркала. В работе приведены результаты эксперимента. Ключевые слова: компактный полигон, расширенные радиоизображения, вынос облучателя из фокуса.

Abstract. Several issues concerning diffraction from pyramidal radio absorber that covers walls of a compact range are considered in this paper. In particular, differences in convergence and localization of higher order diffraction fields are demonstrated in comparison with those scattered on the back wall. In the case of the diffraction from the back wall, the incidence is almost normal to the wall, thus zeroorder field is significantly lower than higher-order reflected harmonics (-70 dB compared to -30 dB). In the case of the back wall, the angle of incidence can be very close to even 90 degrees, thus zero-order harmonic's amplitude becomes higher than amplitudes of high diffraction orders (-20 dB compared to -35 dB). However, the distribution of these fields in compact range's space is different: there are regions in which amplitudes of high diffraction orders are bigger than the amplitude of zero-