Calibration Technique for IR Laser Second Derivative Monitoring of Some Trace Gases in Tropospheric Air

INFRARED TUNABLE DIODE LASER SECOND DERIVATIVE MODULATION SPECTROSCOPY HAS BEEN USED TO MONITOR TRACE GASES IN THE TROPOSPHERE: IN THE CASE OF UNSTABLE OR REACTIVE GASES HOWEVER, CALIBRATION OF THE MEASUREMENT IS A DIFFICULT TASK. IN SOME CASES, THE ABSORPTION DUE TO ATMOSPHERIC CARBON DIOXIDE OR NITROUS OXIDE SIMULTANEOUSLY RECORDED WITH THE TRACE GAS ABSORPTION APPEARS USABLE AS A BUILT-IN CALIBRATION STANDARD: THE PROCEDURE IS DISCUSSED AND EXAMPLES OF POTENTIAL APPLICATIONS ARE GIVEN.NA-NOT AVAILABL