Rotational–vibrational spectroscopy - Wikipedia
Rotational–vibrational spectroscopy is a branch of molecular spectroscopy that is concerned with infrared and Raman spectra of molecules in the gas phase. Transitions involving changes in both vibrational and rotational states can be abbreviated as rovibrational (or ro-vibrational) transitions.
振动跃迁 - 百度百科
方程 (12-9)是由非谐振子模型得到的能级近似解，方程 (12-9)中第二项导致在接近分子解离限的大小v值处可观察到能级的收敛性。 谐振子模型预期所有能级都按 等距离分布，且允许键断裂。 振动能级间跃迁选律为 ，此外，必须发生 偶极矩 变化，以致在1R吸收光谱中同核双原子分子并不显示振动跃迁。 有时可观察到叫做泛频的弱跃迁，这些跃迁对应于 =2或3。 振动能级的通常能量间隔大约为 。 由Boltzmann分布可以看出，不存在外部辐射时，在室温下处于激发态的分子通常 …
Molecular vibration - Wikipedia
A molecular vibration is a periodic motion of the atoms of a molecule relative to each other, such that the center of mass of the molecule remains unchanged. The typical vibrational frequencies range from less than 10 13 Hz to approximately 10 14 Hz, corresponding to wavenumbers of approximately 300 to 3000 cm −1 and wavelengths of ...
13.2: Rotations Accompany Vibrational Transitions - Chemistry …
Rotational and Vibration transitions (also known as rigid rotor and harmonic oscillator) of molecules help us identify how molecules interact with each other, their bond length as mentioned in previous section. In order to know each transitions, we have to consider other terms like wavenumber, force constant, quantum number, etc.
Franck–Condon principle - Wikipedia
The quantum mechanical formulation of this principle is that the intensity of a vibronic transition is proportional to the square of the overlap integral between the vibrational wavefunctions of the two states that are involved in the transition.
Each line of the high-resolution vibrational spectrum of a gas-phase heteronuclear diatomic molecule is found to consist of a large number of closely spaced components (band spectra). The separation between the components is of the order of 10 cm-1 – the structure is due rotational transitions accompanying the vibrational transition.
Lecture 2: Rotational and Vibrational Spectra 1. Light-matter interaction 2. Rigid-rotor model for diatomic molecule 3. Non-rigid rotation 4. Vibration-rotation for diatomics
Because the vibrational eigenstates involve spatial degrees of freedom and not spin, we immediately recognize that it is the electric field (and not magnetic) that is important here. Thus, we can write the transition matrix element as:
In polyatomics, we can also have a Q branch, where ∆ J = 0 and all transitions lie at ν = ν . This transition is allowed for perpendicular bands: ∂μ ∂q ⊥ to molecular. symmetry axis. There is generally no thermal population in upper (final) state (v’,J’) so intensity should scale as population of lower J state (J”). I changes → B dependent on v.
vibrational transition | Photonics Dictionary | Photonics …
Vibrational transitions involve a change in the vibrational state of a molecule, specifically a transition from one vibrational energy level to another. Key points about vibrational transitions: Vibrational energy levels: Molecules can vibrate in different modes, and each vibrational mode has associated energy levels.