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Outline
We applied the Brillouin scattering and diamond-anvil cell (DAC) technique to study the liquid oxygen at high pressure and high temperature. The single-frequency green (532 nm) laser was used as Brillouin excitation source, and the Brillouin spectra were collected by a newly developed 3+3 pass tandem Fabry-Perot interferometer. The sample was loaded into a modified Merrill-Bassett-type four-screw DAC and heated externally by a resistance heater. The backscattering and 60° scattering geometries were used simultaneously. In this paper, we presented the pressure dependences of sound velocities of liquid oxygen under high pressure and high temperature, and the results were consistent with those predicated by theoretical calculations. The elastic constants of liquid oxygen were determined under high pressure and high temperature, we suspected that the volume of liquid oxygen doesn't expend with temperature under the pressure range from 2.3 GPa to 4.9 GPa.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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