Determination of laser line frequencies and vibrational-rotational constants of the 12C18O2, 13C16O2, and 13C18O2 isotopes from measurements of CW beat frequencies with fast HgCdTe photodiodes and microwave frequency counters

摘要: Abstract The frequencies of 12 C 18 O 2 , 13 16 and isotope lasers have been measured to better than 3 MHz (0.0001 cm −1 ) by comparing with a reference laser. Heterodyne techniques were used generate 139 difference in liquid nitrogen cooled HgCdTe photodiode. Microwave frequency counter measurements the then calculate new values for band centers rotational constants rare isotopes. Procedures achieve further improvements are discussed.