Chemical Sciences: A Manual for CSIR-UGC National Eligibility Test for Lectureship and JRF/Terahertz spectroscopy

Terahertz frequency radiation for spectroscopy is typically generated in one of three ways:
 * time domain terahertz spectroscopy (TDTS), using ultrashort laser pulses
 * photomixing, mixing two radiation sources to generate their difference frequency
 * Fourier transform spectroscopy, using a blackbody radiation source