Conversion of Energy Units and Other Useful Conversions

Conversion of Energy Units and Other Useful Conversions 

The conversion of energy units is based on the relationships presented in Eq. 3-3 (Kurzweil, 2000). 

This set of equations connects Planck s photon energy Ep with Einstein s mass/en-ergy equivalence, with Boltzmann s kinetic energy, with the kinetic energy of a particle and with the kinetic energy of an electron in an electric field of a voltage U of 1 V. The most important conversion factors used in photochemistry and photophysics are collected in Tab. 3-2. 

The spectral domains of UV radiation discussed in Fig. 3-9 and the corresponding energy conversions according to Eq. 3-3 are summarized in Tab. 3-3. In addition, this table contains information about the emission hnes of several types of lamp that are of interest to photochemical AOPs. Photochemists usually use the energy unit kj moh, whereas physicists prefer the unit eV (electron volt), and spectroscopists are used to wavenumber a=l/X in cm instead of wavelength. 

Example 3-3 Convert the radiant energy of 1 eV of a photon into the unit J and calculate the corresponding wavelength of the photon  

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