Mass-correlated rotational Raman spectra with high resolution, broad bandwidth, and absolute frequency accuracy.

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Proceedings of the National Academy of Sciences of the United States of America, ISSN: 1091-6490, Vol: 115, Issue: 20, Page: 5072-5076

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Schröter, Christian; Lee, Jong Chan; Schultz, Thomas
Proceedings of the National Academy of Sciences; NATL ACAD SCIENCES
Multidisciplinary; multidimensional spectroscopy; correlated measurement; rotational alignment; Raman spectroscopy; high-resolution spectroscopy
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article description
We present mass-correlated rotational alignment spectroscopy, based on the optical excitation of a coherent rotational quantum wave and the observation of temporal wave interferences in a mass spectrometer. Combined electronic and opto-mechanical delays increased the observation time and energy resolution by an order of magnitude compared with preceding time-domain measurements. Rotational transition frequencies were referenced to an external clock for accurate absolute frequency measurements. Rotational Raman spectra for six naturally occurring carbon disulfide isotopologues were resolved with 3 MHz resolution over a spectral range of 500 GHz. Rotational constants were determined with single-kilohertz accuracy, competitive with state-of-the-art frequency domain measurements.