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- W3123882477 abstract "Buffer gas cooling with a $^4$He gas is used to perform laser-absorption spectroscopy of the $^{12}$C$_2$H$_2$ ($nu_1+nu_3$) band at cryogenic temperatures. Doppler thermometry is first carried out to extract translational temperatures from the recorded spectra. Then, rotational temperatures down to 20 K are retrieved by fitting the Boltzmann distribution to the relative intensities of several ro-vibrational lines. The underlying helium-acetylene collisional physics, relevant for modeling planetary atmospheres, is also addressed. In particular, the diffusion time of $^{12}$C$_2$H$_2$ in the buffer cell is measured against the $^4$He flux at two separate translational temperatures; the observed behavior is then compared with that predicted by a Monte Carlo simulation, thus providing an estimate for the respective total elastic cross sections: $sigma_{el}(100 {rm K})=(4pm1)cdot 10^{-20}$ m$^{2}$ and $sigma_{el}(25 {rm K})=(7pm2)cdot 10^{-20}$ m$^{2}$." @default.
- W3123882477 created "2021-02-01" @default.
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- W3123882477 date "2015-03-04" @default.
- W3123882477 modified "2023-09-24" @default.
- W3123882477 title "LOW-TEMPERATURE SPECTROSCOPY OF THE<sup>12</sup>C<sub>2</sub>H<sub>2</sub>(υ<sub>1</sub>+ υ<sub>3</sub>) BAND IN A HELIUM BUFFER GAS" @default.
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- W3123882477 doi "https://doi.org/10.1088/0004-637x/801/1/50" @default.
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