Chapter 41: Q. 12 (page 1207)
Draw a series of pictures, similar to the ground states ofand.
Short Answer
The ground states of is , is,isandis.
Chapter 41: Q. 12 (page 1207)
Draw a series of pictures, similar to the ground states ofand.
The ground states of is , is,isandis.
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Get started for freeWhat is the angular momentum of a hydrogen atom in
(a) a state and
(b) a state? Give your answers as a multiple of U.
Predict the ground-state electron configurations of and ?
When all quantum numbers are considered, how many different quantum states are there for a hydrogen atom with? With? With? List the quantum numbers of each state.
A hydrogen atom in its fourth excited state emits a photon with a wavelength of nm. What is the atomโs maximum possible orbital angular momentum (as a multiple of ) after the emission?
The Nobel Prize in physics went to Steven Chu, Claude Cohen-Tannoudji, and William Phillips for their development of techniques to slow, stop, and โtrapโ atoms with laser light. To see how this works, consider a beam of rubidium atoms traveling at after being evaporated out of an oven. A laser beam with a wavelength of is directed against the atoms. This is the wavelength of the transition in rubidium, with being the ground state, so the photons in the laser beam are easily absorbed by the atoms. After an average time of , an excited atom spontaneously emits a wavelength photon and returns to the ground state.
a. The energy-momentum-mass relationship of Einsteinโs theory of relativity is . A photon is massless, so the momentum of a photon is . Assume that the atoms are traveling in the positive x-direction and the laser beam in the negative x-direction. What is the initial momentum of an atom leaving the oven? What is the momentum of a photon of light?
b.The total momentum of the atom and the photon must be conserved in the absorption processes. As a consequence, how many photons must be absorbed to bring the atom to a halt?
NOTE Momentum is also conserved in the emission processes. However, spontaneously emitted photons are emitted in random directions. Averaged over many absorption/emission cycles, the net recoil of the atom due to emission is zero and can be ignored.
c. Assume that the laser beam is so intense that a ground-state atom absorbs a photon instantly. How much time is required to stop the atoms?
d. Use Newtonโs second law in the form to calculate the force exerted on the atoms by the photons. From this, calculate the atomsโ acceleration as they slow.
e. Over what distance is the beam of atoms brought to a halt?
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