The Ca ii infrared triplet's performance as an activity indicator compared to Ca ii H and K Empirical relations to convert Ca ii infrared triplet measurements to common activity indices
High resolution infrared spectroscopy has permitted a determination of the configurations of the epimeric 1,5-dimethylbicyclo[3,3,l]non-2-en-9-ols. The occurrence of hydrogen bonding (OH+x) in one isomer has been related to gas-liquid chromatographic retention times of these compounds. The appearance of v(CH) and 6(CH,) absorptions at abnormally high frequencies can be correlated with the non-bonded intractions inherent in this ring system, and strongly indicate the unexpected twin-chair conformation for the bicyclo[3,3, llnonane framework.IN view of the semi-rigid nature of the bicyc!o[3,3,l]nonane ring system, an examination of the chemical and physical properties of a series of such compounds was of interest.l In the present work a detailed survey of the infrared spectra has revealed unusual absorptionsHydroxyl stretching absorptions in carbon tetrachloride.
International audienceCe travail a pour but l'étude de la dynamique primaire des protéines et de leur rôle dans la fonction du complexe protéique. La technique utilisée est une spectroscopie femtoseconde non linéaire ( $\chi ^{(2)}$) dans le domaine moyen infrarouge. L'ensemble des mouvements de charge induits par une excitation ultra-brève (~11fs) d'un échantillon de membranes orientées de bactériorhodopsine, un analogue bactérien de la protéine photoréceptrice du système visuel chez les mammifères, donne lieu à une émission directionnelle infrarouge (redressement optique). Les caractéristiques de cette émission (fréquence, phase, amplitude, direction) reflètent la réponse électronique et vibrationnelle de la molécule
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