The 1 and 6 bands of diiodo- methane CH 2 I 2 around 3.3  m studied by high-resolution FTS J. Orphal, N. Ibrahim Laboratoire Interuniversitaire des Systèmes.

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Presentation transcript:

The 1 and 6 bands of diiodomethane CH 2 I 2 around 3.3  m studied by high-resolution FTS J. Orphal, N. Ibrahim Laboratoire Interuniversitaire des Systèmes Atmosphériques CNRS UMR 7583, Universités Paris-7 et -12 Créteil / Paris, France C. E. Fellows Laboratorio de Espectroscopia e Laser Universidade Federal Fluminense Niteroi / Rio de Janeiro, Brazil

1. Motivation Diiodomethane is an important source of tropospheric iodine in marine environment CH 2 I 2 is photolysed by sunlight and provides iodine atoms that react with O 3 and HO x species small traces of iodine-containing species can play a very important role in the stratosphere since the potential of iodine species for catalytic ozone depletion is much higher than that of their Cl and Br analogs (because of the much faster kinetics of I chemistry)

1. Motivation Marine aerosol produced from IO x chemistry Laboratory studies are required  spectroscopy OSU 1996

1. Motivation Nature, June 2002

1. Motivation Tropospheric NO 2 from GOME

1. Motivation

2. Previous studies of CH 2 I 2 Kisiel et al. (JCP 1996, JMS 2000) –Ground-state rotational constants –Analysis of the v 4 =n excited states

2. Previous studies of CH 2 I 2 Kisiel et al., JMS, 2000

2. Previous studies of CH 2 I 2 Kisiel et al., JMS, 2000

2. Previous studies of CH 2 I 2 Kisiel et al. (JCP 1996, JMS 2000) –Ground-state rotational constants –Analysis of the v 4 =n excited states Johnson et al. (ACPD 2006): –Quantitative database at 0.1 cm -1 resolution –High-resolution spectra T. Ford (JMS 1975) –IR and Raman spectra of CH 2 I 2 (and deuterated) –“ the 1 band of CH 2 I 2 in the vapor phase has negligible intensity ”

3. Experimental Bruker IFS 120 HR Fourier spectrometer Spectral resolution cm -1 Pyrex cell, path 300 cm, CaF 2 windows CH 2 I 2 at saturated vapour pressure Spectral range cm -1 Working in the dark to avoid photolysis 15 hours integration

4. Results 1 6

4. Results v 4 " =

4. Results Q branches with K a ’ =

4. Results v 4 " =

4. Results From Johnson et al. (ACPD 2006)

4. Results

Lower state’s energy in cm -1

4. Results Q branch positions in cm -1

4. Results Band centers in cm -1

4. Results Rotational constants A in cm -1

4. Results Vibration-rotation interaction in cm -1

Future studies « Global » fit of the 1 and 6 bands and all the « hot bands » with 4 excitation New spectra with a cw DFG laser (LISA) Absorption spectra in a cold jet Acknowledgements T. J. Johnson, T. A. Blake, A. Masiello (PNNL Battelle)