Thermal phonon resonance in nitrogen gas observed by Brillouin scattering
Thermal phonon resonance in nitrogen gas observed by Brillouin scattering
复制标题
DOI：
10.1103/physreva.78.033822
复制
发表时间：
2008-09
影响因子：
2.9
通讯作者：
Y. Minami;Takeshi Yogi;K. Sakai
中科院分区：
文献类型：
--
作者：
Y. Minami;Takeshi Yogi;K. Sakai
利用光加热布里渊散射观察了氮气的热声子共振，并测量了其在MHz区域的声速和吸收系数。光振荡光谱具有$1\phantom{\rule{0.3em}{0ex}}\mathrm{kHz}$的频率分辨率，使我们能够解析热声子共振光谱的精细结构。在由两块平板玻璃组成的谐振腔中，每$185\phantom{\rule{0.3em}{0ex}}\ mathm {kHz}$处观察到声子的共振峰。声速和吸收系数的测量精度显著提高，分别达到${10}^{\ensuremath{-}4}$和${10}^{\ensuremath{-}1}$。
We observed the thermal phonon resonance of nitrogen gas with optical-beating Brillouin scattering and measured the sound velocity and the absorption coefficient in the MHz region. Optical-beating spectroscopy possesses a frequency resolution of $1\phantom{\rule{0.3em}{0ex}}\mathrm{kHz}$, which enabled us to resolve the fine structure of the thermal phonon resonance spectra. Resonance peaks of phonons were observed at every $185\phantom{\rule{0.3em}{0ex}}\mathrm{kHz}$ in the resonance cavity composed of two flat glass plates. The measurement accuracy of the sound velocity and the absorption coefficient was remarkably improved to ${10}^{\ensuremath{-}4}$ and ${10}^{\ensuremath{-}1}$, respectively.