Describe in words that what happens to a photon and its energy/ wavelength in a Raman experiment from the time it is emitted by a laser to the time when it detected as a vibrational anti-strokes line.
When a beam of light falls on a molecule photons are absorbed and scattered. Mostly the scattering is elastic and the scattered photons have exactly the same wavelength as the incident photons. In the scattering process electrons are excited to higher energy level due to collision with photon. These electron fall back to ground state by emitting a photon which has the same wavelength as that of incident photon. This is known as Rayleigh scattering
But sometimes inelastic collision may also take place. In Raman scattering, there is a change in the wavelength of the scattered photon.
It may happen that after the inelastic collision the electron may fall to a higher state (state having more energy than the ground state). since electron still has more energy than it initially had, it results in the emission of a photon having lower energy than the incident photon. These photons give Stokes lines.
The third scenario can be a collision with photon when the electron is already in an excited state (as when at high temperature). In this case, the energy radiated by an electron when returning to the ground state is the sum of the pre-excitation energy and the energy absorbed from the incident photon. Such photons which have higher energy or lower wavelength than the incident photons produce Anti-Stokes lines. Thus, anti-Stokes lines are always of shorter wavelength than that of the light that produces them
Describe in words that what happens to a photon and its energy/ wavelength in a Raman...
When a photon collides with an electron and gives it energy, what happens to the photon after bouncing from the electron? a. the photon frequency remains the same. b. the photon wavelength decreases. c. the photon wavelength remains the same. d. the photon wavelength increases. e. the photon frequency increases.
When a 480 nm laser is used as a light source for a Raman spectrometer, it was observed that one of the anti-Stokes lines has a wavelength of 478 nm. When a 708.6 nm laser is used as the light source, what will the wavelength of the corresponding anti-Stokes line be (in nm)?
What are the (a) energy, (b) magnitude of the momentum, and (c) wavelength of the photon emitted when a hydrogen atom undergoes a transition from a state with n = 7 to a state with n = 5?
true/false 1. Energy of absorbed photon equals energy of emitted photon. 2. Following emission, molecule returns to its lowest energy state by a series of rapid vibrational relaxations. 3. The lifetime of the excited vibrational states is about a femtosecond; the lifetime of the excited electronic state is generally longer than a nanosecond. 4. Photon absorption usually occurs when a molecule is in its ground electronic state.
What is wavelength of a photon that would be emitted when a hydrogen atom makes a transition from the n = 3 to the n = 2 energy level? What is the longest wavelength photon that could ionize a hydrogen atom originally in its ground state? What processes might occur if an electron of energy 12.2 eV collides with a hydrogen atom at rest and in its ground state?
B6.) In the photoelectric effect a photon of wavelength 2 imparts all of its energy to a free electron in a metal. Assume an incident photon has a wavelength of 440 nm. (a) What is the color? (b) What is its energy? (C) Find the wavelength of an electron after absorbing the photon (d) Suppose the separation potential between the electron and the means surface is 1V. What will be the wavelength of the electron upon emergence from the metal?
A photon is emitted when an excited electron relaxes to a lower energy state. What is the shift in energy and wavelength for that photon when in the presence of a magnetic field versus when it is not?
Calculate the,energy of a photon emitted when an electron in a hydrogen atom undergoes a transition from n = 4 to n = 1. energy emitted: 2.71 x10-19 J Assuming that the smallest measurable wavelength in an experiment is 0.330 fm, what is the maximum mass of an object traveling at 885 m s for which the de Broglie wavelength is observable? kg m=
A photon of light produced by a certain laser has an energy of 3.297x10-19). Calculate the frequency (in Hz) and wavelength (in nm) of the photon. 1 4.976e14 Hz wavelength 2 2 6025 nm What is the total energy (in kJ) in 1 mole of these photons? 198.5 xk What is the color of the emitted light? violet blue green yellow orange red
What is the wavelength of a photon whose energy is twice that of a photon with a 700 nm wavelength?