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absorption bands Acta angle anharmonicity approximately atoms axis band intensities beam bolometer calculated carbon carbonyl cell Chapter characteristic Chem components condensed corresponding crystal detector determined diffraction dipole double-beam effect electronegativity electronic emission exit slit factor force constants force field function fundamental given grating H-bonding hydrogen bonding increase infra-red active infra-red region infra-red spectra instrument interaction isotopic linear lines liquid measured method mirror molecular molecular symmetry moments of inertia monochromator Nernst normal coordinates normal modes observed obtained optical oscillator perpendicular phase Phys plane point group polarized polyatomic molecules polymers prism Q branch radiation Raman spectra ratio reflection refractive index rotational sample secular equation selection rules shown in Fig solid solution solvent Spectrochim spectrometer Spectroscopy spectrum stretching frequencies stretching mode structure studies substitution symmetric top symmetry species Table temperature transition usually values vapour vibration frequencies vibrational modes wavelength wavenumber