Absolute Absorption Intensities in the Triad nu3nu5nu6 of C12H3D at 6-10 um

A DUAL BEAM TUNABLE DIODE LASER SPECTROMETER HAS BEEN USED TO MEASURE THE ABSOLUTE INTENSITIES OF 37 LINES OF THE PP, RP AND RQ SUBBANDS IN THE 1062-1132 CM-1 RANGE OF THE NU6 AND OF 25 LINES OF THE QP, QQ AND QR SUBBANDS IN THE 1230-1375 CM-1 RANGE OF NU3 BAND OF 12CH3D. TRANSMISSION SPECTRA WERE RECORDED WITH GAS SAMPLES IN 25+-0.1 OR 90+- 0.1 CM LONG CELLS SIMULTANEOUSLY WITH THE SCANNING OF A 30 CM AIR ETALON (F.S.R. 0.01499 CM-1) USED FOR RELATIVE WAVENUM- BER SCALE CALIBRATION. THE UNCERTAINTY OF THE DERIVED LINE INTENSITIES IS ESTI-MATED BETTER THAN OR EQUAL TO +-5 PERCENT EXCEPT FOR THREE TRANSITIONS OF THE NU6 BAND WHERE THE SPREAD OF DATA INCREASES THE UNCERTAINTY TO +-7 PERCENT. THE DATA HAVE BEEN ANALYZED ON THE BASIS OF THE TRIAD MODEL PREVIOUSLY USED FOR THE ENERGY ANALYSIS OF THE THREE BANDS NU6, NU3 AND NU5. A LINEAR LEAST SQUA- RES PROCEDURE APPLIED TO THE SQUARE ROOTS OF THE EXPERIMENTALLY DERIVED LINE STRENGTHS HAS LED TO A DETERMINATION OF THE THREE DIPOLE MOMENT DERIVATIVES INVOLVED IN THE TRIAD INTENSITY CALCULATION. THE VALUES PBTAINED FOR S6, S3 AND S5 WILL BE COMPARED TO THOSE EXISTING IN THE LITERATURE

RESTELLI Giambattista;  CAPPELLANI Francesco;  TARRAGO G.; 

1995-03-15

JRC5199

https://publications.jrc.ec.europa.eu/repository/handle/JRC5199,