isoelectronic sequence

Isoelectronic sequence

A term used in spectroscopy to designate the set of spectra produced by different chemical elements ionized in such a way that their atoms or ions contain the same number of electrons. The sequence in the table is an example. Since the neutral atoms of these elements each contain Z electrons, removal of one electron from scandium, two from titanium, and so forth, yields a series of ions all of which have 20 electrons. Isoelectronic sequences are useful in predicting unknown spectra of ions belonging to a sequence in which other spectra are known. See Atomic structure and spectra

Example of isoelectronic sequence
Designation Emitting Atomic
of spectrum atom or ion number, Z
Cal Ca 20
Scll Sc+ 21
Tilll Ti2+ 22
VIV V3+ 23
CrV Cr4+ 24
MnVI Mn5+ 25

isoelectronic sequence

[¦ī·sō·i‚lek′trän·ik ′sē·kwəns]
(spectroscopy)
A set of spectra produced by different chemical elements ionized so that their atoms or ions contain the same number of electrons.
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References in periodicals archive ?
1998) studied the radiative rates for transitions within n=2 complex in several ions of boron isoelectronic sequence (6 [less than or equal to] Z [less than or equal to] 28).
The transitions within n = 2 complex of boron and boron-like isoelectronic sequence include forbidden and resonance lines which are important in the study of astrophysical and Tokamak plasmas.
Radiative rates for transitions within the n=2 complex in ions of the boron isoelectronic sequence.
Relativistic study of E1 and M1 transitions in the boron isoelectronic sequence.