求助!!大气ch4除了C12和C13之外其他同分异构体系数!!!详细如下?类似大气中CO2除了12co2和13co2 之外的其他同分异构体系数 ,类似co2中碳同位素文献所述。 [CO2] = [12CO2] + [13CO2] + f [CO2], (3) Ra = [13C]/[12C] = [13CO2]/[12CO2] = RVPDB(1 + δa), (4) [12CO2] = [CO2](1 − f )]/(1 + RVPDB(1 + δa)), (5) and [13CO2]=[CO2](1−f )−[12CO2], (6) where [CO2] is the total mixing ratio including all CO2 isotopomers, f is the fraction (0.00474) of CO2 containing all isotopomers other than 13C16O2 and 12C16O2, and RVPDB is the 13C / 12C standard molar ratio, 0.0111797 (Vienna Peedee Belemnite or VPDB-CO2 scale, i.e., reference material 8544, NBS19) (Allison et al., 1995).The assumption that f is constant should have little impact on [12CO2] and [13CO2] (Griffis et al., 2004). 谢谢各位大佬查看更多1个回答 . 19人已关注
各位大佬们,谁有Ti2Nb10O29的cif文件,或者懂行的朋友帮忙下一下呗。万分感谢?Mixed Oxides of Titanium and Niobium. II. The Crystal Structures of the Dimorphic Forms of Ti2Nb10O29 , A. D. WADSLEY , Acta Cryst. (1961). 14, 664查看更多1个回答 . 3人已关注