基金This work is supported by the National Natural Science Foundation of China (No.20903085), the NKBRSF 2010CB9230, and RFBR-Russia (No.06-05- 39016). The support of the Groupement de Recherche International SAMIA (Spectroscopie d'Absorption des Mol@cules d'Interet Atmospherique) between CNRS (France), RFBR (Russia) and CAS (China) is also acknowledged.