Spectroscopic measurement of the vapour pressure of ice |
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Authors: | Bielska K Havey D K Scace G E Lisak D Hodges J T |
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Affiliation: | Instytut Fizyki, Uniwersytet Miko?aja Kopernika, ul. Grudziadzka 5/7, 87-100 Toruń, Poland. |
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Abstract: | We present a laser absorption technique to measure the saturation vapour pressure of hexagonal ice. This method is referenced to the triple-point state of water and uses frequency-stabilized cavity ring-down spectroscopy to probe four rotation-vibration transitions of at wavenumbers near 7180?cm(-1). Laser measurements are made at the output of a temperature-regulated standard humidity generator, which contains ice. The dynamic range of the technique is extended by measuring the relative intensities of three weak/strong transition pairs at fixed ice temperature and humidity concentration. Our results agree with a widely used thermodynamically derived ice vapour pressure correlation over the temperature range 0°C to -70°C to within 0.35 per cent. |
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