Mukhopadhyay, I.DCunha, R.2021-09-022021-09-022003International Journal of Infrared and Millimeter Waves, 2003. Vol. 24 (8): pp. 1255-1273http://hdl.handle.net/123456789/234084143 bytestext/htmlenHamiltonianInternal RotationEnergy LevelsOptical PumpingLasersIVRBWOBackward wave oscillator based THz spectroscopy, diatomic formalism and optically pumped lasersArticle