Threshold photoionization at high resolution

Andreas Osterwalder
2001
Conference paper

Because the spectral d. of Rydberg states scales with the third power of the principal quantum no. n, the region immediately below at. and mol. ionization thresholds is spectrally very dense. Studying the properties of high at. and mol. Rydberg states just below threshold (at n>100) thus represents a real exptl. challenge. At the same time, it offers the opportunity to obtain, by Rydberg series extrapolation, very detailed information on the energy level structure of mol. ions. Recent exptl. progress will be reviewed that have enabled us to obtain information on high at. and mol. Rydberg states at an unprecedented resoln. The methods we have developed rely on the use of a home-built broadly tunable near-Fourier-transform-limited pulsed extreme UV laser system with a bandwidth of better than 210 MHz and of double-resonance techniques with which the spectra of high Rydberg states can be measured at a spectral resoln. of 60 kHz. Recent applications of these methods to the study of the threshold ionization of small mol. systems will be presented. [on SciFinder (R)]

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Andreas Osterwalder
2001
Conference paper

Abstract

Official source

https://infoscience.epfl.ch/record/147998?ln=en

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Related concepts (4)

Principal quantum number

In quantum mechanics, the principal quantum number (symbolized n) is one of four quantum numbers assigned to each electron in an atom to describe that electron's state. Its values are natural numbers (from 1) making it a discrete variable. Apart from the principal quantum number, the other quantum numbers for bound electrons are the azimuthal quantum number l, the magnetic quantum number ml, and the spin quantum number s. As n increases, the electron is also at a higher energy and is, therefore, less tightly bound to the nucleus.

Information

Information is an abstract concept that refers to that which has the power to inform. At the most fundamental level, information pertains to the interpretation (perhaps formally) of that which may be sensed, or their abstractions. Any natural process that is not completely random and any observable pattern in any medium can be said to convey some amount of information. Whereas digital signals and other data use discrete signs to convey information, other phenomena and artefacts such as analogue signals, poems, pictures, music or other sounds, and currents convey information in a more continuous form.

Energy level

A quantum mechanical system or particle that is bound—that is, confined spatially—can only take on certain discrete values of energy, called energy levels. This contrasts with classical particles, which can have any amount of energy. The term is commonly used for the energy levels of the electrons in atoms, ions, or molecules, which are bound by the electric field of the nucleus, but can also refer to energy levels of nuclei or vibrational or rotational energy levels in molecules.