The Raman spectra of anthracene single crystal have been measured at 300K and 77K using CW Ar laser 5145Å excitation. The Raman lines were observed in the region 20-2900cm

-1

. The results are as follows:1. Most of Raman spectra have symmetry line shape and very sharp. However

in the region 20-200cm

-1

the Raman spectra are broad and overlap each other.2. Fundamental vibrations of anthracene crystals are assigned according to the space group of anthracene crystal and the distribution of Raman active normal vibrations among the symmetry classes in anthracene. From the results it appears that the assignments of the a

g

b

1g

b

3g

normal mode vibrations agree with experiment and theoretical results from references.3. The lattice vibrational Raman spectra of anthracene crystals exhibit remarkable temperature effects. In the region 20-200cm

-1

at 300K

the spectra are so broad and overlapping that spectra hardly distinguished from each other; at 77K

the individual spectra get sharp and at the same time they shift toward higher frequencies. The mean square amplitude of the rotational oscillation of the anthrecene molecule about one of the principal axes is calculated in order to explain the effects of temperature on Raman spectra.