Ko OKUMURA and Yoshitaka TANIMURA
[Phys. Rev. E 56, 2747 (1997)]
A harmonic system coupled to a heat bath comprised of harmonic oscillators through a non-bilinear system-bath interaction q2 qj is considered, where q and qj are the system and bath coordinates, respectively. The two-time correlation functions for the model are analytically obtained through a diagrammatic expansion. Numerical calculations of the analytical results are presented for the spontaneous (frequency-domain) Raman spectroscopy. Comparison with numerical results from the conventional linear-coupling model (the Brownian oscillator model) are made, which indicates experimentally distinguishable temperature dependencies.