Эксперименты по молекулярной спектроскопии на новосибирском терагерцовом лазере на свободных электронах

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Abstract

Уникальные параметры Новосибирского лазера на свободных электронах (НЛСЭ) позволяют проводить в Центре коллективного пользования на его основе уникальные эксперименты по спектроскопии молекул. В статье подробно описаны параметры излучения терагерцового НЛСЭ. Кратко представлены проделанные на этом лазере эксперименты по молекулярной спектроскопии с соответствующими ссылками, где эти работы описаны подробно. Рассмотрены потенциально возможные, пока нереализованные эксперименты на терагерцовом НЛСЭ в области молекулярной спектроскопии сверхвысокого разрешения.

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About the authors

В. В. Кубарев

Институт ядерной физики им. Г. И. Будкера СО РАН

Author for correspondence.
Email: vitaly.kubarev@yandex.ru
Russian Federation, Новосибирск, 630090

Е. Н. Чесноков

Институт химической кинетики и горения им. В. В. Воеводского СО РАН

Email: vitaly.kubarev@yandex.ru
Russian Federation, Новосибирск, 630090

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Supplementary files

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2. Fig. 1. Characteristic spectrum of radiation of a terahertz FEL near the center frequency of 2 THz in the resonant unstable mode (a), spectrum scan (a) near the center for the mode with low-frequency mode instability (a'); spectrum of a terahertz FEL in the stabilized stable mode (b), spectrum scan (b) near the center for the mode without low-frequency mode instability (b').

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3. Fig. 2. Optical diagram of a heterodyne polarization spectrometer. The arrows in the circles show the direction of polarization of the electric field of the radiation.

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4. Fig. 3. Spectral resolution of the heterodyne polarization spectrometer as a function of measurement time. The leftmost experimental point has a resolution of 1000 at a measurement time of 300 ps; it was obtained in an experiment on spectroscopy of individual FEL pulses in the modulation instability mode.

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5. Fig. 4. Spectra of individual FEL pulses in the modulation instability mode (three solid lines) and the FEL spectrum recorded under the same conditions with a Fourier spectrometer (averaged over many pulses) with the same spectral resolution (dashed line, side frequencies are not detected).

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6. Fig. 5. Free induction signal of a natural isotopic mixture of HBr molecules between two powerful short excitation pulses of the NFEL. The inset shows the spectral lines producing this signal. High-frequency modulation is isotopic splitting of the lines.

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7. Fig. 6. Free induction signal of OH radical: without magnetic field (a), in a weak magnetic field for polarization perpendicular to the polarization of the exciting pulse of the NFEL, which is completely suppressed (b). High-frequency modulation of both signals is the Λ-splitting of OH lines, independent of the magnetic field. Low-frequency modulation, dependent on the magnetic field value, is the effect of beating of lines split by the Zeeman effect and non-Faraday rotation of the plane of polarization.

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