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1/e attenuation distances 80 nsec amplitude anharmonic interactions anharmonic lifetime anharmonic processes antistokes approximately bolometer characteristic impedance circuit coaxial cable collision term condenser lens constantan CONTINUE TYPE crystal curves Debye decay delay density detector determined diffusion coefficient diffusion equation elastic scattering electronic energy flux equation equilibrium experiment experimental Figure film temperature flourescence Fourier Sine transform Fourier transform FREQUENCY CTHz frequency dependence heat pulse heater film heater pulse impedance injected phonons input interface Krytron Laplace transform laser lattice LEGEND low frequency phonons low-frequency phonons luminescence metal film mode temperature versus obtained optical output phonon distribution phonon distribution function phonon frequency phonon propagation phonon-phonon interactions phonons of frequency photodiode photomultiplier Phys Planck distribution probe ions purely diffusive qualitative quasi-equilibrium temperature sample shown in Fig slit spatial spectral spectrometer substrate temperature versus frequency thermal THz phonons transfer function vibronic sidebands W.E. Bron W.L. Schaich