BRIEF COMMUNICATIONS: Detection of low concentrations of I2 vapor by laser excitation of its fluorescence
The temperature dependence of the concentration of the I2 vapor was determined by the laser excitation of its fluorescence. The sources of excitation of the I2 molecules were an argon laser and a cw dye laser. The minimum amount of the I2 vapor which could be recorded by this methid was 2×106 molecules, corresponding to a concentration of 5×108 molecules/cm3. The minimum detectable number of molecules occupying one vibrational-rotational level was 2.4×104.