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 ...

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 ...

Their existence as separate intermediates and their triplet character were recently demonstrated by electron spin resonance spectroscopy 4. We have investigated the photolysis of several aromatic ...

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 ...