Easy to employ calculator!
Demand a quick unit of measurement conversion from wavelength (nm) to photon energy (eV)? Need to convert flux (ph/south) to average power (gW)? Only enter the known value in the boxes beneath, and the figurer volition provide the equivalent value in the appropriate unit.
Calculation Theory
Photon Energy and Wavelength
The energy of lite (or photon energy), E, is inversely proportional to the wavelength by the equation:
E = hc/l(equation 1)
where h is Planck's constant (6.6261 x 10-34 J*s) and c is the speed of lite (2.9979 x 10viii chiliad/s).
Photon energy can exist expressed using any unit of energy such as the electronvolt (eV) or the Joule (J). For brusk wavelength sources in the EUV to X-ray range, researchers frequently discuss photon energies in units of eV (or keV for hard X-rays) out of convenience. The International Organization of Quantities (SI) have defined 1 eV to the exact value of 1.602176 634 ×10−nineteen J. Thus, equation i above tin be rewritten for photon energy in eV and wavelength in nm as:
E (eV) = 1239.8 / fifty (nm) (equation 2)
Flux and Power
Power (P) is the rate of energy transfer with the SI unit of ane Watt = i J/s. The power of curt wavelength calorie-free sources in the EUV to X-ray range are often expressed as photon flux (F) in the units of photons per second (ph/s). Average power is related to flux and photon energy by:
P = F × E (equation 3)
P = F × hc/fifty (equation 4)
P (mDue west) = 1.989 × 10-10 ×F/l (nm) (equation 5)
For any given flux and wavelength (in nm), equation 5 can be used to calculate the corresponding boilerplate power (in kW).
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