Hot gases don’t produce a continuous emission spectrum. Black hydrogen absorption lines are at the same wavelength as the bright hydrogen emission lines. Key fact Line emission spectra are ...

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 ...

The spectrum reflects the behavior of the molecule quinine sulfate which provides the bitter taste in tonic water. For this measurement we used a UV LED (400 nm) to excite the quinine. Also shown ...

Each of the spectra has a set of absorption lines created by the presence of hydrogen in the stars' atmospheres. Order the spectra, starting with the one that is moving the fastest toward us and ...

See, for example, Jones, J. G., Poole, J. B., Tomkinson, J. C., and Williams, R. J. P., J. Chem. Soc., 2001 (1958).

NITRENES, molecular fragments with an electron sextet on nitrogen, are known to be the primary products of the decomposition of organic azides 1–3. Their existence as separate intermediates and ...

Modern analytical techniques, such as atomic absorption spectrometry, enable the accurate detection of even traces of heavy ...