Useful FTIR Info & Links

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Useful FTIR Info & Links

IR Unit Conversions

Useful FTIR Info & Links

Energy unit conversions:

1 cm^-1 =		0.124 meV	0.030 THz	1.44 Kelvin
1 meV =	8.1 cm^-1		0.242 THz	11.6 Kelvin
1 THz =	33 cm^-1	4.14 meV		48 Kelvin
1 Kelvin =	0.70 cm^-1	0.086 meV	0.021 THz

Conversions for microns (wavelength) to and from wavenumbers (cm^-1):

microns = 10⁴ / x cm^-1

cm^-1 = 10⁴ / x microns

Absorbance units:

A = log ( 1/T )
Where A is Absorbance and T is Transmittance

Pressure unit conversions:

	mbar	Pascal N/M²	Torr mm Hg	micron	inch of Hg	psi lb/in²	atm
1 mbar =	1	100	0.75	750	2.95E-2	1.45E-2	9.87E-4
1 Pascal 1 N/M²=	1E-2	1	7.5E-3	7.5	2.95E-4	1.45E-4	9.87E-6
1 Torr 1 mm Hg =	1.333	133	1	1E3	3.937E-2	1.934E-2	1.316E-3
1 micron =	1.333E-3	0.1333	1E-3	1	3.937E-5	1.934E-5	1.316E-6
1 inch of Hg =	33.86	3.386E3	25.4	2.54E4	1	0.491	3.34E-2
1 psi 1 lb/in² =	68.9	6.89E3	51.71	5.171E4	2.036	1	6.8E-2
1 atm =	1013	1.013E5	760	7.6E5	29.9	14.7	1

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