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For example, when this treatment is applied to CO 2, it is found that the C=O stretches are not independent, but rather there is an O=C=O symmetric stretch and an O=C=O asymmetric stretch: symmetric stretching: the sum of the two C–O stretching coordinates; the two C–O bond lengths change by the same amount and the carbon atom is stationary ...
For example, the water molecule has three normal modes of vibration: symmetric stretch in which the two O-H bond lengths vary in phase with each other, asymmetric stretch in which they vary out of phase, and bending in which the bond angle varies. The molecular symmetry of water is C 2v with four irreducible representations A 1, A 2, B 1 and B 2.
In CO 2, the bending vibration ν 2 (667 cm −1) has symmetry Π u.The first excited state of ν 2 is denoted 01 1 0 (no excitation in the ν 1 mode (symmetric stretch), one quantum of excitation in the ν 2 bending mode with angular momentum about the molecular axis equal to ±1, no excitation in the ν 3 mode (asymmetric stretch)) and clearly transforms according to the irreducible ...
Editor’s note: Before beginning any new exercise program, consult your doctor.Stop immediately if you experience pain. As you head into the gym, you likely already have a workout plan in mind ...
This word ending—thought to be difficult for Spanish speakers to pronounce at the time—evolved in Spanish into a "-te" ending (e.g. axolotl = ajolote). As a rule of thumb, a Spanish word for an animal, plant, food or home appliance widely used in Mexico and ending in "-te" is highly likely to have a Nahuatl origin.
Stretching can be dangerous when performed incorrectly. There are many techniques for stretching in general, but depending on which muscle group is being stretched, some techniques may be ineffective or detrimental, even to the point of causing hypermobility, instability, or permanent damage to the tendons, ligaments, and muscle fiber. [7]