VIBPACK: A package to treat multidimensional electron-vibrational molecular problems with application to magnetic and

Juan M Clemente-Juan1, Andrew Palii2,3, Boris Tsukerblat4

  • 1Instituto de Ciencia Molecular, Universidad de Valencia, C/ Catedrático José Beltrán, 2, Paterna, 46980, Spain.

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When Infrared (IR) radiation passes through a covalently bonded molecule, the bonds transition from lower to higher vibrational levels. The fundamental vibrational motions that result in infrared absorption can be classified as stretching or bending vibrations.
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A covalently bonded heteronuclear diatomic molecule can be modeled as two vibrating masses connected by a spring. The vibrational frequency of the bond can be expressed using an equation derived from Hooke's law, which describes how the force applied to stretch or compress a spring is proportional to the displacement of the spring. In this case, the atoms behave like masses, and the bond acts like a spring.
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