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The 5$$nu$$$$_{rm NH}$$ and 5$$nu$$$$_{rm ND}$$ vibrational bands of partially deuterated ammonia species

部分重水素置換アンモニアの5$$nu$$$$_{rm NH}$$及び5$$nu$$$$_{rm ND}$$振動バンド

赤木 浩; 横山 啓一; 横山 淳; 和田 晃

Akagi, Hiroshi; Yokoyama, Keiichi; Yokoyama, Atsushi; Wada, Akira

11580$$sim$$11880cm$$^{-1}$$(5$$nu$$$$_{rm ND}$$振動バンド)及び15280$$sim$$15610cm$$^{-1}$$(5$$nu$$$$_{rm NH}$$振動バンド)領域に対し、光音響分光法を用いて、NH$$_{2}$$DとNHD$$_{2}$$分子を含むガスの吸収スペクトルを測定した。スペクトルを解析することにより、NH$$_{2}$$D分子の5$$nu$$$$_{rm ND}$$振動状態及びNHD$$_{2}$$分子の5$$nu$$$$_{rm NH}$$振動状態の回転定数を決定した。また、振動基底状態の回転定数との比較から、回転定数の振動状態依存性、及び振動励起による分子構造の変化を明らかにした。

Absorption spectra of gaseous samples containing NH$$_{2}$$D and NHD$$_{2}$$ have been measured in 11580-11880 and 15280-15610 cm$$^{-1}$$ regions, corresponding to the 5$$nu$$$$_{rm ND}$$ and 5$$nu$$$$_{rm NH}$$ vibrational bands, respectively. Photoacoustic spectroscopy has been utilized for the measurement. The molecular constants of NH$$_{2}$$D in the 5$$nu$$$$_{rm ND}$$ state and NHD$$_{2}$$ in the 5$$nu$$$$_{rm NH}$$ state have been determined by the analysis of the obtained absorption spectrum. Comparing the constants with those of the vibrational ground states, structural changes caused by the stretching excitations have been elucidated. The HND bond angles are decreased by these excitations. The dependence of the molecular constants on the stretching quantum number has been also derived by simple Birge-Sponer and Dunham analyses.

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パーセンタイル:86.42

分野:Physics, Atomic, Molecular & Chemical

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