Diffuse Interstellar Bands and Temperatures in the Interstellar Clouds

The diffuse interstellar bands (DIBs) observed in the optical and infrared spectrum of interstellar clouds remain the oldest unsolved problem in spectroscopy. We have analyzed correlations between normalized DIBs equivalent widths (EW's) and temperatures of interstellar H-2 and CN molecules. The lambda 6284 angstrom DIB is well correlated with T-01 temperature of H-2. The correlation may be caused by DIB profile broadening or more effective production of DIB carrier at higher temperatures. The DIBs: lambda 4964 angstrom, lambda 5797 angstrom and lambda 6614 angstrom are anti-correlated with T-02 temperature of H-2. The anti correlation may be attributed to destruction of DIBs carriers in high-V radiation fields.