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Matsushima, F., Odashima, H., Iwasaki, T., Tsunekawa, S., & Takagi, K. (1994). Frequency measurement of pure rotational transitions of H2O from 0.5 to 5 THz. In Conference on precision electromagnetic measurements digest (pp. 23–24).
Abstract: Frequencies of H2O pure rotational transitions from 0.5 to 5 THz have been measured with an accuracy of one part in 109 using a tunable far-infrared spectrometer. Measured frequencies of more than a hundred spectral lines provide an excellent wavelength and frequency calibration standard for the far infrared.
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