µm		FORMULAE:
nm		λ[nm] = λ[µm]*103
eV		E[eV] = h[eV s]*c[m/s]/λ[µm]*106
cm-1		ν̃[cm-1] = 104/λ[µm]
MHz		ν[MHz] = c[m/s]/λ[µm]
		c = 299792458 m/s h = 4.13566733*10-15 eV s