Astronomical Spectroscopy: An Introduction To The Atomic And by Jonathan Tennyson

By Jonathan Tennyson

I've got a BSci in Astronomy and feature now not but attended grad tuition. I paintings for a global classification observatory that makes use of spectroscopy of a few style in just about all of the technology we do. Having merely had short overviews as an undergrad, this publication was once an ideal subsequent step permitting me to realize a extra thorough realizing the technology that i'm a part of. a few previous wisdom of atomic physics is especially worthy. the issues on the finish of the chapters are important to make sure figuring out of the fabric.

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Extra resources for Astronomical Spectroscopy: An Introduction To The Atomic And Molecular Physics Of Astronomical Spectra (Immperial College Press Advanced Physics Texts)

Example text

1) contains a kinetic energy operator for the motion of each electron and the Coulomb attraction between that electron and the nucleus. The second summation contains the electron–electron Coulomb repulsion term. The Coulomb repulsion between pairs of electrons means the above equation is not analytically soluble, even for the simplest case, the helium atom, for which N = 2. This is how all atoms with two or more electrons justify their label ‘complex’. To make progress on understanding these systems it is therefore necessary to introduce approximations.

2 A proton and an electron recombine to form atomic hydrogen in its 4p state. At what wavelengths will recombination lines be observed? Label each wavelength by its standard series notation. How would the observed emissions differ if the atoms had recombined to the 4s level? 71 A. length would you expect to observe deuterium Hα? What telescope resolution (R = ∆λλ ) would be required to resolve this difference? How does this compare to the resolution required to resolve H and D Lyα transitions? Given a high enough resolution telescope, what D abundance by other problems do you anticipate in obtaining the H observing a single spectral line such as Hα?

In particular, lines belonging to the Balmer series are often seen strongly in emission. Indeed, the characteristic red colour seen in many nebulae comes from Hα. Balmer or other spectral series are obtained from excited atoms spontaneously emitting photons. Every excited state has a half-life τ , similar to that encountered in radioactive decay, which is related to the strength of emission. Thus excited states which decay only by weak line emission are long-lived and those which decay via strong transitions are short-lived.

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