Wavelength & Color
Units & Terms References
| Wavelength (nm) | Color |
| ~730 | onset of human vision |
| 700 | deep red |
| 660 | red |
| 610 | orange-red |
| 600 | orange |
| 590 | yellow-orange |
| 580 | orangish-yellow |
| 570 | yellow |
| 565 | yellow-green |
| 550 | green |
| 530 | pure green |
| 500 | bluish green |
| 498 | blue-green |
| 490 | greenish-blue |
| 480 | blue |
| 470 | indigo |
| 460 | blue-violet |
| 440 | violet |
| ~360 | cutoff of human vision |
These colors are necessarilly approximate and depend on
the settings of your monitor and the phosphors in the screen.
Wavelength (l)
| 1 nm | 10-9 m |
| 1 mm | 10-6 m |
| 1 Å | 10-10 m |
Frequency n = c/l
Hz
_
Energy n
= 1/l cm-1
(wavenumbers) [occasionally presented in mm-1]
1 mm-1 = 10-4 cm = 104 cm-1
= 10,000 cm-1
1 ev = 8068 cm-1
1 cm-1 = 2.859 calorie per mole of photons
Absorbance = e * path (cm) * concentration (moles per liter) = -log10(I/I0)
Internal Transmittance = T = I/I0 (ignores reflections, etc. at the boundary)
0.6 T = 60% T (instruments sometime read %T)
e = molar absorption coefficient (formerly called extinction coefficient)
c = 299,792,458 km sec-1