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不同方向入射光的声子位置不同。
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声子的性质与它们在倒空间中的位置(即波矢)有关,而参与拉曼散射的声子波矢则由激光波长和拉曼入射配置(正入射、掠入射、边入射)决定。
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在我们的实验(绿光)中,参与拉曼散射的声子都位于 Gamma 点附近(距离仅 xxx 埃),而与 Gamma 点的相对方向则根据入射配置而定。
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在我们的实验(绿光)中,参与拉曼散射的声子都位于 Gamma 点附近(距离仅约 0.005 埃),而与 Gamma 点的相对方向则根据入射配置而定。
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对于正入射,声子大致位于 Gamma-A 线上;对于边入射,声子大致位于 Gamma-K 线上。对于掠入射,声子不位于任何高对称线上。
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The properties of phonons depend on their positions in reciprocal space (i.e., their wavevectors),
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and the wavevectors of phonons participating in a Raman scattering process
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are determined by the Raman experiment configuration.
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In our experiments (back-scattering with 532 nm laser light),
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the phonons involved are located very close to the #sym.Gamma point (approximately $5.13 times 10^(-3) angstrom$),
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the phonons involved are located very close to the #sym.Gamma point (approximately $5 times 10^(-3) angstrom$),
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and direction relative to the #sym.Gamma point is determined by the incidence configurations.
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For normal and edge incidence,
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the relevant phonons lie approximately along the #sym.Gamma–A and #sym.Gamma–K lines, respectively,
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