Cheng B M, Chew E P, Liu C P, Bahou M, Lee Y P, Yung Y L, Gerstell M F
Synchrotron Radiation Research Center, Hsinchu, Taiwan.
Geophys Res Lett. 1999 Dec 15;26(24):3657-60. doi: 10.1029/1999gl008367.
The history and size of the water reservoirs on early Mars can be constrained using isotopic ratios of deuterium to hydrogen. We present new laboratory measurements of the ultraviolet cross-sections of H2O and its isotopomers, and modeling calculations in support of a photo-induced fractionation effect (PHIFE), that reconciles a discrepancy between past theoretical modeling and recent observations. This supports the hypothesis that Mars had an early warm atmosphere and has lost at least a 50-m global layer of water. Likely applications of PHIFE to other planetary atmospheres are sketched.
利用氘与氢的同位素比率，可以确定早期火星上水库的历史和规模。我们展示了水及其同位素异构体的紫外截面的新实验室测量结果，以及支持光致分馏效应（PHIFE）的模型计算，该效应调和了过去理论模型与近期观测之间的差异。这支持了火星早期有温暖大气层且至少损失了50米全球水层的假说。文中还概述了PHIFE在其他行星大气层中的可能应用。
