Energy Units Used in Spectroscopy and Solid-State Physics

Energy Units Used in Spectroscopy and Solid-State Physics 

The correspondences between the eV and these units is given below. It is derived from E = eV = hcv = hv = k T = hc/X (the Boltzmann constant is noted b instead of k). 

In the book, 1cm-1 is taken as 0.1239842meV. In the visible and UV regions of the spectrum, the nanometre (nm) wavelength unit is used (1A = 0.1 nm). In the IR region of the spectrum, the pm wavelength unit is mostly used above 2500 nm and below 1 mm. 

Values of Selected Physical Constants Recommended by CODATA (2006) 

In the atomic units (a.u.) system, the permittivity of vacuum is dimensionless and set equal to (4ji) 1, while ao, e2, me, and ft are set equal to unity. The atomic unit of energy, the Hartree, is equal to two times the Rydberg 

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