11/3/2022 0 Comments Atomic spectra![]() ![]() And with the “Show oscillator strength” button, a plot of the oscillator strengths for the spectral lines appears, indicating which transitions are more likely to be detected. Wolfram|Alpha also allows the user to “zoom in” to a particular region in a subpod and toggle between plotting the lines by wavelength, frequency or energy. Atomic spectra full#Similar to the visible spectrum, Wolfram|Alpha plots the full atomic spectrum for all the elements and ions in the NIST database, including labels identifying the electromagnetic region in which they reside. All of this data can now be found in Wolfram|Alpha, including that visible hydrogen spectrum I was so curious about in high school:Īnd, while I didn’t realize it at the time, there are far more emission lines than what can be seen by the human eye in the full ” hydrogen atomic spectrum”. Today, the NIST database has become the most comprehensive and reliable set of data for atomic spectra and includes information about spectral lines and atomic energy levels associated with many elements and ions. Furthermore, atomic spectra are used by astronomers to classify and determine the composition of stars. Investigation of atomic spectra contributed significantly to our understanding of atomic structure and are described by the Rydberg formula. ![]() It is, therefore, with some nostalgia that I announce the addition of the National Institute of Standards and Technology’s ( NIST) atomic spectra database to Wolfram|Alpha. But I clearly remember the intense curiosity I felt about the phenomenon I was witnessing. Brooks put a prism in front of the glowing discharge tube, and several vertical lines of light appeared on the chalk board behind the prism.Īt the time, I didn’t really understand that the voltage applied across the discharge tube was exciting the electrons around the hydrogen atoms and that the lines formed as the pink light passed through the prism were characteristic wavelengths of light being emitted as the electrons around the hydrogen atoms returned to lower energy levels. He turned off the lights in the classroom and turned on a hydrogen discharge tube. We were learning about the structure of the atom, and Mr. For me, one of those moments occurred during my junior year of high school in Mr. Perhaps it is while reading a book or during a lecture given by a good teacher. When we are growing up and learning about the world, there are moments when a topic or idea really catches our attention. ![]()
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