Brightness temperature of water compressed by a double shock to pressures of 60–79 GPa


New data on the temperature of water shock-compressed to 79 GPa are presented. Thermal radiation from a water layer compressed by incident shock waves and shock waves reflected from a lithium fluoride or sapphire window was recorded in the range of incident-wave intensity of 28–36 GPa. The reflected-wave pressures were in the range of 49–79 GPa. The temperature measured at the pressure of 79 GPa was 2750 K, which is much lower than the single-shock temperature at this pressure—5270 K. The radiant flux loss at the interfaces was estimated. The temperature of water compressed by one and two shock waves was calculated using an equation of state model, and the calculation results are in good agreement with the experimental data.

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b0(λ, T):

Blackbody radiance

c v :

Specific heat

L(λ, T, t):

Spectral radiance when the shock moves through the water layer

p :

Pressure in the shock-compressed matter

p 1 :

Pressure in the incident wave

p 2 :

Pressure in the reflected wave

(1 − R1)(1 − R2)(1 − R3):

Transmittance at the surfaces of the layers

(1 − R1′)(1 − R2′)(1 − R3′):

Transmittance of the boundaries after formation of the reflected shock

t :


T :

True temperature of the shock-compressed matter

Tb1 and Tb2 :

Brightness temperatures

Tc1 and Tc2 :

Color temperatures

Tb1, Tc1 :

Temperature of shock-compressed water in the incident shock

u s :

Shock velocity in water

u s1 :

Velocity of the incident wave

u p :

Particle velocity in the incident wave

α :

Absorption coefficient of shocked water

Δt :

Duration of the pressure p1


Emissivity of shocked water

λ :



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Correspondence to S. M. Karakhanov.

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Bordzilovskii, S.A., Karakhanov, S.M. & Khishchenko, K.V. Brightness temperature of water compressed by a double shock to pressures of 60–79 GPa. Shock Waves (2020).

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  • Water
  • Shock wave
  • Temperature calculation
  • Equation of state
  • Double compression
  • Lithium fluoride
  • Sapphire