The scattering of photons from charged particles is called Compton scattering after Arthur Compton who was the first to measure photon-electron scattering in 1922. When the incoming photon gives part of its energy to the electron, then the scattered photon has lower energy and according to the Planck relationship has lower frequency and longer wavelength. The wavelength change in such scattering depends only upon the angle of scattering for a given target particle. The constant in the Compton formula above can be written

and is called the Compton wavelength for the electron. The formula presumes that the scattering occurs in the rest frame of the electron.

For an incoming wavelength

对于入射波长

= nm = x 10^ m 波长结果：= nm（纳米）= x 10^ m（米） 中文译文中的待填/计算数值依次对应：1：wi 2：wib 3：wip。实际数值以上方原输入框为准。

scattered at angle θ=degrees 散射角为θ=度 中文译文中的待填/计算数值依次对应：1：th。实际数值以上方原输入框为准。

the change in wavelength is

波长的变化是

= nm = x 10^ m 波长结果：= nm（纳米）= x 10^ m（米） 中文译文中的待填/计算数值依次对应：1：dw 2：dwb 3：dwp。实际数值以上方原输入框为准。

and the final wavelength is

以及最终的波长是

= nm = x 10^ m 波长结果：= nm（纳米）= x 10^ m（米） 中文译文中的待填/计算数值依次对应：1：wf 2：wfb 3：wfp。实际数值以上方原输入框为准。

Expressed in terms of photon energies, the incoming photon energy is

以光子能量表示时，入射光子能量为

= x 10^ eV = x 10^ joules 能量结果：= x 10^ eV（电子伏特）= x 10^ 焦耳 中文译文中的待填/计算数值依次对应：1：ieb 2：iep 3：ijb 4：ijp。实际数值以上方原输入框为准。

=eV = keV = MeV 能量结果：= eV = keV = MeV 中文译文中的待填/计算数值依次对应：1：ie 2：iek 3：iem。实际数值以上方原输入框为准。

and the scattered photon energy is

= x 10^ eV = x 10^ joules 能量结果：= x 10^ eV（电子伏特）= x 10^ 焦耳 中文译文中的待填/计算数值依次对应：1：feb 2：fep 3：fjb 4：fjp。实际数值以上方原输入框为准。

=eV = keV = MeV 能量结果：= eV = keV = MeV 中文译文中的待填/计算数值依次对应：1：fe 2：fek 3：fem。实际数值以上方原输入框为准。

This implies that the energy transferred to the electron is

这表明传递给电子的能量是

= x 10^ eV = x 10^ joules 能量结果：= x 10^ eV（电子伏特）= x 10^ 焦耳 中文译文中的待填/计算数值依次对应：1：ekb 2：ekp 3：jkb 4：jkp。实际数值以上方原输入框为准。

=eV = keV = MeV . 能量结果：= eV = keV = MeV。 中文译文中的待填/计算数值依次对应：1：kev 2：kevk 3：kevm。实际数值以上方原输入框为准。

This exploration is designed to accept values for the input wavelength or energy and the angle of scattering. Unspecified parameters will default to the case of molybdenum K-alpha xrays scattering at 90 degrees, one of Compton's historical results. Any of these input values can be changed.