Optical Properties of Tholin Produced in a Hydrogen-Rich Early Earth Atmosphere

Grant #: NNA06CB59A
Senior Scientist: Bishun Khare

A systematic study to determine the optical constants of haze (tholin), with the mixing ratio of hydrogen at least 0.3 or more, that might have existed during the epoch of the faint young Sun. This study measures the optical properties of early Earth tholin from the gas composition that will have H2 mixing ratio 0.3 and higher.  We determine several sets of optical constants corresponding to increasing hydrogen mixing ratio and conduct the radiative transfer calculations for each set of tholins.  This helps in understanding the onset of the H2 mixing ratio that started to produce greenhouse effects on the early Earth.