Rapid Scanning Infrared SpectroScopy of Weakly bounded van der Waals molecules

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In order to improve a S/N ratio for a rapid scanning infrared dio de laser spectrometer, a peak position of a reference spectrum was checked andevery sampling data was co-added using a proper shift. A CaF2 window and all non-coating Al mirrors were changed. As the results, the weak P- branch series of the K=1<-0 transition were observed at around 2146cm^<-1> and the K=0<-0 transition and a pair of the R-branch transitions were also observed at around 2142cm^<-1>. However, one series for the P-branch transition was missing. This reason is still puzzling. The intensities of this pair transition observed were about half of these for the K=0<-0 transition. In the case of N_2--CO,N_2 rotates freely in this complex because of a weakly van der Waals binding. Therefore two equivalent nitrogen atoms exist in this complex and there are two spin states which are para (I=1) and ortho (I=2 and 0) states. However, the one set of P-branch transition was missing in N_2--CO.The spectrum of (CO)_2 were still observed and the several strong lines appeared in 2144cm^<-1>. We tried to fit the observed spectra of (CO)_2 using a Loomis-Woods diagram. Unfortunately we did not find correct sets in this region. According to the hardness of the assignment of (CO)_2 spectra, we concluded that there are a couple of the stable structure and their potential barrier between them seems to be very low.