Knowledge Bank

The $\nu 5-\nu 4$ difference band of the vibrational spectrum of deuterated acetylene, DCCD, passes through the microwave and radio frequency portion of the $spectrum.1$ The P(16) transition for both the c and d series have been observed by MBER spectroscopy. These transitions consist of strong $\Delta F=1$ components located essentially at the vibrational transition frequency, and weaker $\Delta F=0$ components split by hyperfine interactions. For the c series line, preliminary analysis yields a center frequency of 365.344 MHz, $eQq(J=16)=207KHz,eQq(J=15)=206KHz,C(J=16)=C(J=15)=0.4KHz$. The center frequency for the d transition occurs at 3222.44 MHz.