Isotopic analysis based on terahertz spectrum  

作　　者：Qijun Chen Yun Liu 

机构地区：[1]Research Center for Planetary Science,College of Earth Sciences,Chengdu University of Technology,Chengdu 610059,China [2]State Key Laboratory of Ore Deposit Geochemistry,Institute of Geochemistry,Chinese Academy of Sciences,Guiyang 550081,China

出　　处：《Acta Geochimica》2023年第5期859-869,共11页地球化学学报（英文）

基　　金：supported by Chinese NSF project(42130114);the strategic priority research program(B)of CAS(XDB41000000);the pre-research Project on Civil Aerospace Technologies No.D020202 funded by Chinese National Space Administration(CNSA).

摘　　要：As a new promising detection technology in the terahertz research field,the terahertz time-domain spec-troscopy(THz-TDS)has very broad application potential in many fields because its advantage on the characteristic spectrum,wide spectrum and non-destructive analysis of interested substances.In this paper,the terahertz absorption spectra of gases mixed with 12 CO and 13 CO in the spec-trum range of 0.5–2.5 THz are measured by terahertz time-domain spectroscopy for the first time.Several isotopo-logues can be clearly distinguished based on the difference in their rotational energies and the consequent terahertz spectrum.The experimental results show that 12 CO and 13 CO have obvious characteristic absorption peaks in the spectrum range of 0.5–2.5 THz due to the difference in rotational energy,and the rotational constant B can be calculated according to the experimental values to distin-guish the two gaseous isotopologues.The frequency posi-tions of the characteristic absorption peak measured by this experiment and the rotation constant B calculated accord-ing to the experimental values are compared with those previous theoretical calculations and experimental results,and they are in good agreement.This result lays a foun-dation for developing more sophisticated terahertz instru-ments to the detection of different isotopologues.

关 键 词：Isotope analysis CO isotopologue Terahertz time-domain spectroscopy(THz-TDS) Rotational spectrum 

分 类 号：P597[天文地球—地球化学]