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Refractivity of Carbon Dioxide Under Simulated Martian Conditions
Author(s) -
Tyler G. Leonard,
Howard H. Taylor
Publication year - 1969
Publication title -
radio science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.371
H-Index - 84
eISSN - 1944-799X
pISSN - 0048-6604
DOI - 10.1029/rs004i010p00899
Subject(s) - martian , carbon dioxide , mars exploration program , radio occultation , sublimation (psychology) , atmosphere of mars , atmospheric sciences , atmosphere (unit) , atmospheric temperature range , materials science , environmental science , analytical chemistry (journal) , thermodynamics , chemistry , geology , ionosphere , physics , environmental chemistry , astrobiology , psychology , organic chemistry , geophysics , psychotherapist
The refractivity of carbon dioxide has been measured at 2.26 GHz under simulated Martian conditions and at standard temperature and pressure. In the temperature range of 150° to 190°K, at pressures from 2 to 25 millibars, the refractivity per molecule per cm 2 is 1.78 × 10 −17 ± 0.06 when scaled by the ideal gas law. The measurements include pressures and temperatures which are within 30°C of the sublimation curve. This result is slightly lower than the best measurements previously obtained near standard temperature and pressure at other frequencies (1.8345 × 10 −17 ± 0.0003) and at 2.26 GHz under standard conditions by the authors (1.8413 × 10 −17 ± 0.005). It is concluded that the scaled refractivity of CO 2 in the range of temperatures and pressures stated above may be a few percent lower than under standard conditions. These results do not significantly alter the conclusions regarding the atmosphere of Mars as measured by the radio occultation method.