Infrared Sharp
Chemistry Help?
The emission spectrum of hydrogen consists of several series of sharp emission lines in the ultraviolet (Lyman series) in the visible (Balmer series) and in the infrared (Paschen series, Brackett series, etc.) regions of the spectrum.
(a) What feature of the electronic energies of the hydrogen atom explains why the emission spectrum consists of discrete wavelength rather than a continuum wavelength?
(b) Account for the existence of several series of lines in the spectrum. What quantity distinguishes one series of lines from another?
(c) Draw an electronic energy level diagram for the hydrogen atom and indicate on it the transition corresponding to the line of lowest frequency in the Balmer series.
(d) What is the difference between an emission spectrum and an absorption spectrum? Explain why the absorption spectrum of atomic hydrogen at room temperature has only the lines of the Lyman series.
The existence of emission spectra confirms that there are discrete energy levels in atoms. The fact that there are a number of series confirms that these levels are organised into groups of levels called quantum shells, or quantum levels.
I am sure that you can look up and copy an energy level diagram for the Balmer series.
An absorption spectrum of hydrogen is different from an emission spectrum in that the absorption spectrum consists of only one series, the Lyman series. This is because in emission, all possible levels are populated before the photons are emitted, but in absorption, they are only in the ground state.
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