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Phonon-Induced Fine Structure of Excitons in Solid Nitrogen

E. BourseyLaboratoire des Interactions Moléculaires et Hautes Pressions, Centre National de la Recherche Scientifique, Université Paris-Nord, F-93440 Villetaneuse, FranceV. ChandrasekharanLaboratoire des Interactions Moléculaires et Hautes Pressions, Centre National de la Recherche Scientifique, Université Paris-Nord, F-93440 Villetaneuse, FranceP. GürtlerLaboratoire des Interactions Moléculaires et Hautes Pressions, Centre National de la Recherche Scientifique, Université Paris-Nord, F-93440 Villetaneuse, FranceE.E. KochLaboratoire des Interactions Moléculaires et Hautes Pressions, Centre National de la Recherche Scientifique, Université Paris-Nord, F-93440 Villetaneuse, FranceP. L. KunschLaboratoire des Interactions Moléculaires et Hautes Pressions, Centre National de la Recherche Scientifique, Université Paris-Nord, F-93440 Villetaneuse, FranceV. SaileLaboratoire des Interactions Moléculaires et Hautes Pressions, Centre National de la Recherche Scientifique, Université Paris-Nord, F-93440 Villetaneuse, France
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ABI

Abstract

Results of quantitative high-resolution absorption measurements in the range of the $w^{1}\ensuremath{\Delta}_{\mathrm{u}}\ensuremath{\leftarrow}X{^{1}\ensuremath{\Sigma}_{\mathrm{g}}}^{+}$ and $a^{1}\ensuremath{\Pi}_{\mathrm{g}}\ensuremath{\leftarrow}X{^{1}\ensuremath{\Sigma}_{\mathrm{g}}}^{+}$ derived exciton progressions in solid ${\mathrm{N}}_{2}$ are reported. The newly observed detailed fine structure of the vibrational bands is analyzed in terms of a sharp zero-phonon line and phonon-assisted exciton transitions. A theoretical analysis based on a strong-exciton-phonon-coupling model leads to good agreement with the observed experimental line shape.

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