Speeds of sound in CF4 between 175 and 300 K measured with a spherical resonator
Speeds of sound in CF4 between 175 and 300 K measured with a spherical resonator
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DOI：
10.1063/1.456165
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发表时间：
1989-01
影响因子：
4.4
通讯作者：
M. B. Ewing;J. Trusler
中科院分区：
文献类型：
--
作者：
M. B. Ewing;J. Trusler
描述了一种装置，该装置利用了球形谐振器在80至350 K的温度范围内在高达1.3 MPa的压力下的高精度。我们已经使用的球形谐振器的径向模式测量的速度和吸收的声音在CF4在温度范围175至300 K和压力范围0.08至1.0 MPa。精确度优于0.001%的声速已用于获得理想气体热容以及CF4的第二和第三声学维里系数。计算得到的（p，V，T）维里系数与文献值符合得很好。我们还报告了CF4的振动弛豫时间确定的径向模式的线宽。
An apparatus is described that exploits the high precision of a spherical resonator in the temperature range 80 to 350 K at pressures up to 1.3 MPa. We have used the radial modes of the spherical resonator to measure the speed and absorption of sound in CF4 in the temperature range 175 to 300 K and the pressure range 0.08 to 1.0 MPa. The speeds of sound, which have a precision better than 0.001% have been used to obtain perfect‐gas heat capacities and second and third acoustic virial coefficients of CF4. (p,V,T) virial coefficients calculated from the results are in good agreement with those in the literature. We also report vibrational relaxation times for CF4 determined from the linewidths of the radial modes.