WE have recently completed an examination of the infra-red absorption spectra of the monoxide and dioxide of chlorine. The unstable nature of these substances demanded the use of a monochromator ...

This causes an absorption spectra, as shown below. Because the energy levels are the same, the lines in the emission spectra of an element are in the same position as the lines in the absorption ...

Forget all-or-nothing approaches, Dean Ornish, MD, says. His latest diet plan, called the Spectrum diet, is not about banning foods. He ranks foods from the healthiest ("Group 1") to the most ...