positive ion


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positive ion

[′päz·əd·iv ′ī‚än]
(chemistry)
An atom or group of atoms which by loss of one or more electrons has acquired a positive electric charge; occurs on ionization of chemical compounds as H+from ionization of hydrochloric acid, HCl.
References in periodicals archive ?
It is observed that the linearity of ginsenosides detected in the negative ion mode was better than that in the positive ion mode.
Specifically, Calcote and King considered only positive ions and electrons in their equilibrium calculations (produced by thermal ionization).
All the fragmentations of cellulose are present and the base peak of fragmentation appears at m/e 76 due to positive ion or free radical positive ion of CS2.
Since ceramides in positive ion mode MS/MS generate characteristic product ions of m/z 264 and 282, precursor ion scans of m/z 264 and m/z 282 were used for detecting ceramides in the adipose tissue.
Another one was stimulated by the same iontophoretic device, but the two electrodes were put in opposite positions than the previously discussed one for positive ion stimulation.
Subscripts i = n and i = p appear for negative and positive ions respectively.
If the potential is too low the positive ions and the free electrons will recombine before they reach the anode.
These electrons can be excited to higher energy levels, and at appropriate electron beam energies, the atom can lose that electron producing a positive ion. These ejected electrons are known as secondary electrons.
The positive ion density was a moderate 2,700/[cm.sup.3] and the negative ion density was 2,400/[cm.sup.3].
He suggested that dissolved electrolytes were indeed completely dissociated in solution but that each positive ion was attended by a cloud of negative ions, while each negative ion was attended by a cloud of positive ions.
Positive ions are arranged in different geometries around DNA and RNA: in so-called site-bound or contact-pair geometries, a positive ion is located in direct contact with an oxygen atom of a phosphate group.

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