第五章 Fine structures of Atoms：The electron moving around the nucleus produce a circle current, which shows that electron has magnetic moment. The electron not only has the magnetic moment from orbital but also has the one from spin. The quantum number of spin is 1/2. The total angular momentum of electron should include the orbital angular momentum and spin momentum. They will couple together to generate the fine structure of atom. When the atom is put into a magnetic field, its spectrum will be separated more lines which is called as Zeeman effect due to the magnetic moment.5.1Atomic Physics:The electron moving around the nucleus generates the a magnetic moment[单选题]An atom with the states 2G9/2 and 2H11/2 is placed in a weak magnetic field. How many transitions can be observed? ( )
5.2Larmor precession:The Larmor precession about magnetic moment of atom in a magnetic field is introduced.
5.3Quantum Magnetic moment of electron:The magnetic moment of electron in quantum physics is related to the angular moment.
5.4Stern-Gerlach experiment:Stern-Gerlach experiment shows that the angular moment of electron is quantized in space.
5.5Intrinsic Spin:The electron has an intrinsic spin with half integer to explain the Stern-Gerlach experiment.
5.6Nuclear Megnetic resonance:The spin of nucleus will interact with the external magnetic field.
5.7Total Magnetic moment:A total magnetic moment should include the contributions from orbital angular moment and spin angular moment
5.8Spin-orbit coupling:The spin magnetic moment of electron is influenced by the magnetic field generated by the orbital angular moment.
5.9Zeeman effect:The spectrum of atom will be affected by an external magnetic field.
5.10Selection rules:The transitions between two energy levels should satisfy the selection rules.
5.11Anomalous Zeeman effect:A atom without total spin zero has the anomalous Zeeman effect in an external magnetic field.
5.12Polarization of Zeeman effect:The spectrum from the Zeeman effect is polarized.
5.13Grotrian Diagram:The Grotrian diagram is a very simple scheme to discuss the Zeeman effect.
5.14Exercise:There are several exercises about the fine structure of atom.
选项:[20
, 30
, 35
, 12
]
[单选题]In anomalous Zeeman effect, a level of give, s, l, j splits into ( )
选项:[2l+1 levels
, 2j+1 levels
, 2s+1 levels
, 0 or 2j+1 levels
]
[单选题]A sample of a certain element is placed in a 0.300 T magnetic field and suitably excited. How far apart are the Zeeman components of the 450 nm spectral line of this element? ( )
选项:[3.72 fm
, 6.94 nm, 1.45 nm
, 2.83 pm
]
[单选题]For a hydrogen atom in the 6f state, the minimum angle between the orbital angular momentum vector and the z axis is ( )
选项:[45O
, 60O
, 30O
, 90O
]
[单选题]An experimenter wants to separate silver atoms in a Stern-Gerlach experiment by at least 1 cm (a large separation) as they exit the magnetic field. To heat the silver, she has an oven that can reach 1000°C and needs to order a suitable magnet. What should be the magnet specifications? ( )
选项:[24 T·m, 57 T·m
, 39 T·m
, 75 T·m
]
[单选题]An electron whose orbital quantum number is 2 has the length of angular momentum ( ).选项:[ 4
, 2h
, 2.08 eV, 2.6×10-34 J·s
]
[单选题]The Bohr magneton is ( )
选项:[9.27×10-23 J/K, 9.27×10-24 J/T
, 9.27×10-25 J/T, 9.27×10-24 eV/T
]
[单选题]The Lande factor of 2S1/2 is ( ) 选项:[0.67
, 2, 3, 1
]
[单选题]
选项:[2.32×10-4 eV
, 9.12×10-24 J
, 7.40×10-23 J
, 1.16×10-4 eV
]
[单选题]An energy difference of 4×10-3 eV for the 3p subshell of sodium accounts for the how many splitting of a spectral line at 589.3 nm is ( )
选项:[0.6 nm
, 1.1 nm
, 1.8 nm
, 1.2 nm]
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