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Raman spectroscopy study of ammonia borane at high pressure
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10.1063/1.3040276
/content/aip/journal/jcp/129/23/10.1063/1.3040276
http://aip.metastore.ingenta.com/content/aip/journal/jcp/129/23/10.1063/1.3040276
View: Figures

Figures

Image of FIG. 1.
FIG. 1.

Evolution of the N–H stretching modes of ammonia borane with pressure. (a) Pressure dependent Raman spectra of the N–H stretching region. With increasing pressure (bottom to top), the spectra correspond to 0.7, 1.0, 1.1, 1.3, 1.6, 2.3, 3.5, 4.0, 4.9, 6.0, 7.1, 8.3, 9.5, 10.2, 11.2, 12.1, 12.8, 13.8, 14.4, 15.0, 15.7, 16.2 16.5, 17.1, 18.0, 18.4, 19.4, 20.6, 21.0, and 22.3 GPa, respectively. (b) Raman frequency shift as a function of pressure: asymmetric N–H stretching mode (filled triangles) and symmetric N–H stretching mode (open triangles). The vertical dashed lines are a guide for the eye indicating location of bonding changes associated with transitions. In these modes, changes at 5 and 12 GPa are apparent.

Image of FIG. 2.
FIG. 2.

Evolution of the B–H stretching modes with pressure. (a) Raman spectra of the B–H stretching region. With increasing pressure (bottom to top), the spectra correspond to 0.7, 1.0, 1.1, 1.3, 1.6, 2.3, 3.5, 4.0, 4.9, 6.0, 7.1, 8.3, 9.5, 10.2, 11.2, 12.1, 12.8, 13.8, 14.4, 15.0, 15.7, 16.2 16.5, 17.1, 18.0, 18.4, 19.4, 20.6, 21.0, and 22.3 GPa, respectively. (b) Raman frequency shift as a function of pressure: asymmetric B–H stretching mode (filled triangles), symmetric B–H stretching mode (open triangles), and the overtone of the symmetric B–H bending mode (open squares). Transitions at 2 and 12 GPa can be seen in these modes.

Image of FIG. 3.
FIG. 3.

Evolution of the B–N stretching modes and low frequency rocking modes with pressure. (a) Raman spectra of the B–N stretching modes and a combined B–H and N–H rocking mode (located at in the 0.7 GPa spectra). With increasing pressure (bottom to top), the spectra correspond to 0.7, 1.0, 1.1, 1.3, 1.6, 2.3, 3.5, 4.0, 4.9, 6.0, 7.1, 8.3, 9.5, 10.2, 11.2, 12.1, 12.8, 13.8, 14.4, 15.0, 15.7, 16.2 16.5, 17.1, 18.0, 18.4, 19.4, 20.6, 21.0, and 22.3 GPa, respectively. (b) Raman frequency shift as a function of pressure: stretching mode (filled triangles), stretching mode (open triangles), low frequency rocking mode (open circles). In these modes, changes at 2 and 12 GPa can be seen.

Image of FIG. 4.
FIG. 4.

Evolution of the B–H bending modes with pressure. (a) Raman spectra of the B–H bending region. With increasing pressure (bottom to top), the spectra correspond to 0.7, 1.0, 1.1, 1.3, 1.6, 2.3, 3.5, 4.0, 4.9, 6.0, 7.1, 8.3, 9.5, 10.2, 11.2, 12.1, 12.8, 13.8, 14.4, 15.0, 15.7, 16.2 16.5, 17.1, 18.0, 18.4, 19.4, 20.6, 21.0, and 22.3 GPa, respectively. (b) Raman frequency shift as a function of pressure: asymmetric B–H bending mode (filled triangles) and symmetric B–H bending mode (open triangles). In these modes, changes at 2, 5, and 12 GPa can be seen.

Image of FIG. 5.
FIG. 5.

Evolution of the N–H bending modes of ammonia borane with pressure. (a) Raman spectra of the N–H bending region. The pressures measured are listed as 0.7, 1.0, 1.1, 1.3, 1.6, 2.3, 3.5, 4.0, 4.9, 6.0, 7.1, 8.3, 9.5, 10.2, 11.2, 12.1, 12.8, 13.8, 14.4, 15.0, 15.7, 16.2 16.5, 17.1, 18.0, 18.4, 19.4, 20.6, 21.0, and 22.3 GPa, respectively, from bottom to top. (b) Raman frequency shift as a function of pressure: overtone mode of the low frequency rocking modes (filled triangles), asymmetric N–H bending mode (open triangles). In these modes, changes at 5 and 12 GPa can be seen.

Image of FIG. 6.
FIG. 6.

Evolution of lattice vibrational modes of ammonia borane with pressure. (a) Raman spectra of the lattice vibration region. The pressures measured are listed as 0.5, 0.9, 1.3, 1.7, 2.6, 3.9, 5.6, 7.3, 9.4, 11.2, 11.6, 12.4, 13.0, 13.7, 14.0, and 15.8 GPa, respectively, from bottom to top. (b) Raman frequency shift as a function of pressure: lattice vibrational modes (filled triangles). In these modes, changes at 2 and 12 GPa can be seen.

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/content/aip/journal/jcp/129/23/10.1063/1.3040276
2008-12-17
2014-04-21
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Raman spectroscopy study of ammonia borane at high pressure
http://aip.metastore.ingenta.com/content/aip/journal/jcp/129/23/10.1063/1.3040276
10.1063/1.3040276
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