title: High-precision CO2 isotopologue spectrometer with a difference-frequency-generation laser source.
abstract: A precision laser spectrometer for the detection of CO(2) isotopes is reported. The spectrometer measures the fundamental absorption signatures of (13)C and (12)C isotopes in CO(2) at 4.32 microm using a tunable mid-IR laser source based on difference-frequency generation. The spectrometer attains a precision of up to 0.02 per thousand for 150 s of averaging. An overall accuracy of 0.05 per thousand was obtained when sampling various calibrated reference gases.
authors.affiliation: Earth Observing Laboratory, National Center for Atmospheric Research, Boulder, CO 80301, USA. dr@ucar.edu
authors.forename: Dirk
authors.initials: D
authors.lastname: Richter
authors.forename: Bryan P
authors.initials: BP
authors.lastname: Wert
authors.forename: Alan
authors.initials: A
authors.lastname: Fried
authors.forename: Petter
authors.initials: P
authors.lastname: Weibring
authors.forename: James G
authors.initials: JG
authors.lastname: Walega
authors.forename: James W C
authors.initials: JW
authors.lastname: White
authors.forename: Bruce H
authors.initials: BH
authors.lastname: Vaughn
authors.forename: Frank K
authors.initials: FK
authors.lastname: Tittel