Photon energy

The energy of a photon is:

$E_{\mathrm {photon} }={\frac {hc}{\lambda }}$

Where h is the Planck constant, and c is the speed of light. Note that x-ray energies are usually reported in electron-volts (1 J = 6.2415096471204×¹⁵ keV).

Lookup tables

Far Infrared

E	λ		E	λ		E	λ		E	λ		E	λ
1.24 meV	999.873 µm		1.96 meV	634.075 µm		3.08 meV	402.102 µm		4.86 meV	254.996 µm		7.67 meV	161.707 µm
1.26 meV	980.267 µm		1.99 meV	621.642 µm		3.15 meV	394.218 µm		4.96 meV	249.996 µm		7.82 meV	158.536 µm
1.29 meV	961.046 µm		2.03 meV	609.453 µm		3.21 meV	386.488 µm		5.06 meV	245.094 µm		7.98 meV	155.428 µm
1.32 meV	942.202 µm		2.08 meV	597.503 µm		3.27 meV	378.910 µm		5.16 meV	240.288 µm		8.14 meV	152.380 µm
1.34 meV	923.728 µm		2.12 meV	585.787 µm		3.34 meV	371.481 µm		5.26 meV	235.577 µm		8.30 meV	149.392 µm
1.37 meV	905.615 µm		2.16 meV	574.301 µm		3.40 meV	364.197 µm		5.37 meV	230.957 µm		8.47 meV	146.463 µm
1.40 meV	887.858 µm		2.20 meV	563.041 µm		3.47 meV	357.055 µm		5.48 meV	226.429 µm		8.63 meV	143.591 µm
1.42 meV	870.449 µm		2.25 meV	552.001 µm		3.54 meV	350.054 µm		5.59 meV	221.989 µm		8.81 meV	140.776 µm
1.45 meV	853.382 µm		2.29 meV	541.177 µm		3.61 meV	343.191 µm		5.70 meV	217.636 µm		8.98 meV	138.015 µm
1.48 meV	836.649 µm		2.34 meV	530.566 µm		3.68 meV	336.461 µm		5.81 meV	213.369 µm		9.16 meV	135.309 µm
1.51 meV	820.244 µm		2.38 meV	520.162 µm		3.76 meV	329.864 µm		5.93 meV	209.185 µm		9.35 meV	132.656 µm
1.54 meV	804.161 µm		2.43 meV	509.963 µm		3.83 meV	323.396 µm		6.05 meV	205.084 µm		9.53 meV	130.055 µm
1.57 meV	788.393 µm		2.48 meV	499.964 µm		3.91 meV	317.055 µm		6.17 meV	201.062 µm		9.72 meV	127.505 µm
1.60 meV	772.934 µm		2.53 meV	490.161 µm		3.99 meV	310.838 µm		6.29 meV	197.120 µm		9.92 meV	125.005 µm
1.64 meV	757.778 µm		2.58 meV	480.550 µm		4.07 meV	304.743 µm		6.42 meV	193.255 µm		10.12 meV	122.554 µm
1.67 meV	742.920 µm		2.63 meV	471.127 µm		4.15 meV	298.768 µm		6.54 meV	189.466 µm		10.32 meV	120.151 µm
1.70 meV	728.353 µm		2.68 meV	461.889 µm		4.23 meV	292.910 µm		6.67 meV	185.751 µm		10.53 meV	117.795 µm
1.74 meV	714.072 µm		2.74 meV	452.833 µm		4.32 meV	287.167 µm		6.81 meV	182.108 µm		10.74 meV	115.485 µm
1.77 meV	700.070 µm		2.79 meV	443.954 µm		4.40 meV	281.536 µm		6.94 meV	178.538 µm		10.95 meV	113.221 µm
1.81 meV	686.343 µm		2.85 meV	435.249 µm		4.49 meV	276.016 µm		7.08 meV	175.037 µm		11.17 meV	111.001 µm
1.84 meV	672.886 µm		2.91 meV	426.714 µm		4.58 meV	270.603 µm		7.22 meV	171.605 µm		11.39 meV	108.824 µm
1.88 meV	659.692 µm		2.96 meV	418.347 µm		4.67 meV	265.297 µm		7.37 meV	168.240 µm		11.62 meV	106.690 µm
1.92 meV	646.757 µm		3.02 meV	410.145 µm		4.77 meV	260.096 µm		7.52 meV	164.941 µm		11.85 meV	104.598 µm

Near Infrared

E	λ		E	λ		E	λ		E	λ		E	λ
1.77 eV	700.5 nm		1.99 eV	624.6 nm		2.23 eV	556.9 nm		2.50 eV	496.5 nm		2.80 eV	442.7 nm
1.78 eV	697.0 nm		2.00 eV	621.5 nm		2.24 eV	554.1 nm		2.51 eV	494.0 nm		2.81 eV	440.5 nm
1.79 eV	693.5 nm		2.01 eV	618.4 nm		2.25 eV	551.3 nm		2.52 eV	491.6 nm		2.83 eV	438.3 nm
1.80 eV	690.1 nm		2.02 eV	615.3 nm		2.26 eV	548.6 nm		2.53 eV	489.1 nm		2.84 eV	436.1 nm
1.81 eV	686.6 nm		2.03 eV	612.2 nm		2.27 eV	545.9 nm		2.55 eV	486.7 nm		2.86 eV	434.0 nm
1.81 eV	683.2 nm		2.04 eV	609.2 nm		2.28 eV	543.2 nm		2.56 eV	484.3 nm		2.87 eV	431.8 nm
1.82 eV	679.8 nm		2.05 eV	606.1 nm		2.29 eV	540.5 nm		2.57 eV	481.9 nm		2.89 eV	429.7 nm
1.83 eV	676.4 nm		2.06 eV	603.1 nm		2.31 eV	537.8 nm		2.59 eV	479.5 nm		2.90 eV	427.5 nm
1.84 eV	673.1 nm		2.07 eV	600.1 nm		2.32 eV	535.1 nm		2.60 eV	477.1 nm		2.91 eV	425.4 nm
1.85 eV	669.7 nm		2.08 eV	597.1 nm		2.33 eV	532.4 nm		2.61 eV	474.7 nm		2.93 eV	423.3 nm
1.86 eV	666.4 nm		2.09 eV	594.2 nm		2.34 eV	529.8 nm		2.62 eV	472.4 nm		2.94 eV	421.2 nm
1.87 eV	663.1 nm		2.10 eV	591.2 nm		2.35 eV	527.1 nm		2.64 eV	470.0 nm		2.96 eV	419.1 nm
1.88 eV	659.8 nm		2.11 eV	588.3 nm		2.36 eV	524.5 nm		2.65 eV	467.7 nm		2.97 eV	417.0 nm
1.89 eV	656.5 nm		2.12 eV	585.3 nm		2.38 eV	521.9 nm		2.66 eV	465.3 nm		2.99 eV	414.9 nm
1.90 eV	653.2 nm		2.13 eV	582.4 nm		2.39 eV	519.3 nm		2.68 eV	463.0 nm		3.00 eV	412.8 nm
1.91 eV	650.0 nm		2.14 eV	579.5 nm		2.40 eV	516.7 nm		2.69 eV	460.7 nm		3.02 eV	410.8 nm
1.92 eV	646.7 nm		2.15 eV	576.7 nm		2.41 eV	514.2 nm		2.70 eV	458.4 nm		3.03 eV	408.8 nm
1.93 eV	643.5 nm		2.16 eV	573.8 nm		2.42 eV	511.6 nm		2.72 eV	456.2 nm		3.05 eV	406.7 nm
1.94 eV	640.3 nm		2.17 eV	570.9 nm		2.44 eV	509.1 nm		2.73 eV	453.9 nm		3.06 eV	404.7 nm
1.95 eV	637.1 nm		2.18 eV	568.1 nm		2.45 eV	506.5 nm		2.75 eV	451.6 nm		3.08 eV	402.7 nm
1.96 eV	634.0 nm		2.19 eV	565.3 nm		2.46 eV	504.0 nm		2.76 eV	449.4 nm		3.09 eV	400.7 nm
1.97 eV	630.8 nm		2.20 eV	562.5 nm		2.47 eV	501.5 nm		2.77 eV	447.1 nm		3.11 eV	398.7 nm
1.98 eV	627.7 nm		2.22 eV	559.7 nm		2.48 eV	499.0 nm		2.79 eV	444.9 nm		3.13 eV	396.7 nm