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ESR studies of nitrogen atoms stabilized in aggregates of krypton–nitrogen nanoclusters immersed in superfluid helium
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10.1063/1.4765092
/content/aip/journal/ltp/38/11/10.1063/1.4765092
http://aip.metastore.ingenta.com/content/aip/journal/ltp/38/11/10.1063/1.4765092

Figures

Image of FIG. 1.
FIG. 1.

ESR spectra of N atoms in an as-prepared N–N2–Kr–He sample at 1.35 K (1). The sample was prepared from a [N2]/[Kr]/[He] = 1/5/1200 gas mixture. ESR spectra of N atoms in an as-prepared N–N2–He sample at 1.35 K (2). The sample was prepared from a [N2]/[He] = 1/1200 gas mixture.

Image of FIG. 2.
FIG. 2.

ESR spectra of N atoms in an as-prepared N–N2–Kr–He sample at 1.35 K (1). The sample was prepared from a [N2]/[Kr]/[He] = 1/5/1200 gas mixture. ESR spectra of N atoms in an as-prepared N–N2–He sample at 1.35 K (2). The sample was prepared from a [N2]/[He] = 1/1200 gas mixture.

Image of FIG. 3.
FIG. 3.

Dependence of the average concentration of N atoms stabilized in nitrogen–krypton–helium samples on the N2/Kr ratio in various gas mixtures. The ratio between the impurity species ([N2] + [Kr]) and He in the gas mixture was kept equal to 1/200 for all gas mixtures used for the preparation of IHC samples.

Image of FIG. 4.
FIG. 4.

ESR spectra of spin pair radicals (1) and individual nitrogen atoms (2) in a N–Kr–He condensate at T = 1.35 K. Intensity of the spin pair radicals line was multiplied by a factor of 1875. The spectra are obtained in the sample prepared with the N2/Kr/He = 4/1/1000 gas mixture.

Image of FIG. 5.
FIG. 5.

Dependence of the average concentration of N atoms on the temperature for samples prepared from the [N2]/[Kr]/[He] = 1/50/10 000 (▪) and [N2]/[Kr]/[He] = 1/2/600 (▿) gas mixtures.

Image of FIG. 6.
FIG. 6.

Transformation of ESR spectra of nitrogen atoms stabilized in samples prepared with the [N2]/[Kr]/[He] = 1/2/600 gas mixture. Spectra were obtained at different temperatures T, K: 1.401 (a), 2.8 (b), 3.5 (c), and 5.02 (d).

Image of FIG. 7.
FIG. 7.

Experimental ESR spectrum of N atoms for an as-prepared nitrogen–krypton–helium sample formed by the [N2]/[Kr]/[He] = 1/2/600 gas mixture is shown as a solid line (1). The sum of the fitting lines is shown as a dotted line (2) (a). Three triplets of fitting lines used for the decomposition of the experimental ESR spectrum: 3 – triplet of Lorentzian lines with line width 9.47 G and hyperfine splitting, A = 4.97 G, 4 – triplet of Lorentzian lines with line width 1.99 G and A = 4.39 G, 5 – triplet of Lorentzian lines with line width 76.97 G and A = 4.12 G. The weights of each triplet in the spectra were found to be 13.5%, 0.6%, and 84.4%, respectively (b).

Image of FIG. 8.
FIG. 8.

Structure of nitrogen–krypton–helium nanoclusters with stabilized N atoms.

Tables

Generic image for table
Table I.

Hyperfine structure constants, A, g factors, peak to peak widths, ΔHpp , and local concentrations for N atoms in N–Kr–He condensates obtained from ESR line fittings.

Generic image for table
Table II.

Hyperfine structure constants, A, and g factors for N atoms in N2 and Kr matrices.

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/content/aip/journal/ltp/38/11/10.1063/1.4765092
2012-11-30
2014-04-17
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: ESR studies of nitrogen atoms stabilized in aggregates of krypton–nitrogen nanoclusters immersed in superfluid helium
http://aip.metastore.ingenta.com/content/aip/journal/ltp/38/11/10.1063/1.4765092
10.1063/1.4765092
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