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Extra info for Ion Association in Proton Transfer Reactions. Use of ESR for the Quantitative Determination of Gas Phase Atom and Radical Concentrations

Example text

0 2 (3Σβ) The matrix elements have been given by Tinkham and Strandberg20 in the form μίΛ = i[2-0023]2j82[4|S,|&], where the product [4\Sx\fj] exp (—EJkT) is tabulated for a number of transitions. The experimental quantities dv/dH given in Table 5 may be used with eq. (13) to calculate the geff values. These are really only valid within a range of 200-300 MHz around the frequency of about 9500 MHz where they were measured,20 but the error introduced somewhat beyond this range is probably negligible for practical intensity purposes.

The 2D5/2 spectrum has 15 lines in three groups, centered at H = 0-5952v for gj = 1-2005, with a hyperfine group separation of 68 G. Nitrogen-15 This isotope differs from N 1 4 only in having / = 1/2, so the quadrupole coupling term in eq. (7) vanishes identically. The spectrum consists of just two lines for Μτ = ± 1/2, each being triply degenerate as above. The coupling constant A = 14-63 MHz30 and the line separation is 5-2 G. The center of the doublet is again found from eq. (10). Phosphorus This atom is exactly analogous to N 15 , with *S3/2 ground state and / = 1/2.

Second-order Zeeman effects cause the splitting within each hyperfine group. The 2D5/2 spectrum has 15 lines in three groups, centered at H = 0-5952v for gj = 1-2005, with a hyperfine group separation of 68 G. Nitrogen-15 This isotope differs from N 1 4 only in having / = 1/2, so the quadrupole coupling term in eq. (7) vanishes identically. The spectrum consists of just two lines for Μτ = ± 1/2, each being triply degenerate as above. The coupling constant A = 14-63 MHz30 and the line separation is 5-2 G.

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