Large Amplitude Vibrations in the HFClF Complex

نویسندگان

  • Stella M. Resende
  • Josefredo R. Pliego
  • B. De Almeida
چکیده

Os movimentos de grande amplitude no complexo HF...ClF foram estudados teoricamente. Na solução das equações dinâmicas foi utilizada uma superfície de energia potencial ab initio calculada a nível MP2/DZ+(2d1f/2p1d)//HF/DZP, incluindo a correção para o erro de superposição do conjunto de bases (BSSE). A freqüência para o estiramento da ligação de van der Waals e a freqüência e a intensidade da deformação HF...Cl foram calculadas e comparadas com valores experimentais harmônicos teóricos e experimentais disponíveis. A freqüência de estiramento calculada é 97,60 cm, a qual está em excelente acordo com o valor experimental harmônico de 100 ± 2 cm. O valor para esta freqüência incluindo a anarmonicidade é 89,38 cm. A freqüência fundamental calculada para a deformação HF...Cl é 13,12 cm, enquanto cálculos ab initio considerando a aproximação harmônica prevêem um valor de 72 cm. Esta diferença significativa é devida ao movimento de tunelamento através do ângulo HF...Cl, o qual tem uma barreira para esta rotação interna de 151 cm. As intensidades destas transições foram calculadas em duas temperaturas. Em 10 K, apenas a transição fundamental é significativa, enquanto que a 300 K uma banda quente em 81,30 cm, resultante de uma transição entre o terceiro e o quarto nível, domina o espectro.

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تاریخ انتشار 1997