Sentences with phrase «excited vibrational states»

For a collection of CO2 molecules, say at 20» C, what proportion of the molecules are in the various excited vibrational states accessible to CO2?

If your question is how the energy trapped by the atmosphere gets transferred to O2, N2..., the answer is that the excited vibrational state of CO2 is long - lived.

Not exact matches

This is done by exciting the molecule, by infrared laser light, into a vibrational state that spontaneously decays into the ground state.

However, excitation of the ν6 in - plane rocking mode in H2CC results in appreciable tunneling - facilitated mixing with highly vibrationally excited states of acetylene, leading to broadening and / or spectral fine structure that is largely suppressed for analogous vibrational levels of D2CC.

In these regions, excited rotational - vibrational («rovibrational») states of the ground electronic state of H

His extensive work on the photochemistry of the visual pigment rhodopsin has established the structure of the primary photoproduct using time - resolved vibrational spectroscopy, demonstrated that the primary cis - to - trans photoisomerization in vision is complete in only 200 fs, and revealed the excited state photoisomerization dynamics for the first time.

Collisions between gas molecules produce excited rotational, vibrational and electronic states that spontaneously emit photons.

Almost immediately (nanoseconds) they relax from their excited state by either 1) emitting that energy as a new photon, some of which will continue up towards space, some of which will go back downward to be reabsorbed, thus keeping the energy in the atmosphere longer, or 2) by colliding with another gas molecule, most likely an O2 (oxygen) or N2 (nitrogen) molecule since they make up over 98 % of the atmosphere, thereby converting the extra vibrational energy into kinetic energy by transferring it to the other gas molecule, which will then collide with other molecules, and so on, making the air warmer.

We use a different symbol * and ⁺ for the excited states to differentiate the energy modes — vibrational (*) for CO2 and translational (⁺) for N2.

CO2 begins re-emitting again after the average temperature of the LTE increases to the amount that CO2 in thermal equilibrium has a non-trivial excited state population in the relevant vibrational mode.

This reads «a vibrationally excited CO2 molecule CO2 * collides with an N2 molecule and relaxes to a lower vibrational energy state CO2 while the N2 molecule increases its velocity to N2 ⁺ ``.

So when a molecule absorbs a photon (which, by definition results in an excited vibrational and / or rotational state) the very process of re-establishing equilibrium means that some of that energy winds up in translation.

Collisional excitation and relaxation of the vibrational excited states of GHGs is much faster than absorption and emission throughout the troposphere AND most of the stratosphere (local thermodynamic equilibrium).