5314027791

POSTER SESSION. H57

SECOND TRIAD OF H_;0: NEW ANALYSIS OF YIBRATION-ROTATION SPECTRA IN THE REGION OF V|+v* v₂+v* AND 3v_: BANDS AND CONFIRMATION OF HIGHLY EXCITED STATES FROIM FLAME

SPECTRA.

^iU S N MIKHAILENKO,⁽²⁾ YT G TYUTEREY.^(,ł V I STARIKOV,

K A ALBERT.⁽⁴⁾ B P WINNEW1SSER.^<4) M WINNEWISSER.⁽⁴⁾ G MELLAU. C CAMY-PEYRET.^,5> R LANOUETIN. and ⁽⁶) J -M FLAUP

^,n Jnsłitut d'Optique Atmospherique. I Academic des Sciences de-Russie. /.

Avenue Akademicheskii. 634055 Tomsk. Russie

¹'^v Groupe de Spectrometric Moleculaire et Atmospherupie. UPRESA CNRS 06089, Univcrsite de Reims. Faculte des Sciences. Moulin de la Housse. BP 1039. 51687 Reims Cedex 2. France

’ " Department o/Physics. Ohio Northern (Jniversity. Ada. OH

^,4> Justus-Liebig-llniversitaet Giessen. Heinrich-Buff-Ring 58. D-35392 Giessen. Germany

' Ixihoratoire de Physique Moleculaire et Applications. Umverslte Picrre et Marie Curie. Tour 13. Bfe 76. 4 place Jussieu. 75252 Parts Cedex 05. France

^fr/lxihoratoire de Photophysigue Moleculaire. l/niversiie Paris-Sud. Bat 213. 9/405 Orsay. France

The new analysis of the second triad of H₂^,60 ( bands v,+v₂, v₂+v₃, and 3v₂) and the theoretical modeling of the upper ro-vibrational States (110)/(030)/(011) are presented Infrared spectra have been recorded at room temperaturę in the rangę 4300-6300 cm'¹ at resolutions between 0 008 cm'¹ and 0 013 cm ¹ The use of fiilly evacuated transfer optics and a White-type multi-redection celi madę large pressurexpathlength products possible (up to 26 mbarx288 m) The high signal-to-noise ratio allowed us to observe lines having intensities as smali as 10 *’ cm /mol cm*^: at T=296K About 2300 lines have been assigned to the second triad and 580 upper State energies have been determined up to J= 19 and Ka^lO. The anomalously strong centrifugal distortion of ro-vibrationa! Ievels and resonance interactions have been accounted for using the generating function model The RMS standard deviation of the least-squares fit of observed data was 8* 10'¹ cm ¹ The assignments of certain highly excited States have been confirmed by the analysis of flame spectra