Có 20+ tài liệu thuộc chủ đề "vật lý laser"
tainguyenso.vnu.edu.vn Xem trực tuyến Tải xuống
ĐỀ CƯƠNG MÔN HỌC ĐẠI HỌC QUỐC GIA HÀ NỘI TRƯỜNG ĐẠI HỌC KHOA HỌC TỰ NHIÊN. ĐỀ CƯƠNG MÔN HỌC VẬT LÝ LASER 1. Thông tin về môn học. Tên môn học: Vật lý Laser - Mã môn học: V5.94 - Số tín chỉ: 2 - Giờ tín chỉ đối với các hoạt động học tập + Nghe giảng...
tailieu.vn Xem trực tuyến Tải xuống
The expectation value of the energy in this state is greater than or equal to the ground state energy E 0 : ψ | H ˆ | ψ ≥ E 0 . All particles in nature belong to one of the following classes:. The state vector of N identical bosons is totally symmetric with respect to the exchange of any...
tailieu.vn Xem trực tuyến Tải xuống
The neutrino counters have an accuracy of the order of 10% and the energy is E = 4 GeV. Above which distances 12 and 23 of the production point of the neutrinos can one hope to detect oscillations coming from the superpositions 1 ↔ 2 and 2 ↔ 3?. Such neutrinos are produced in the collision of high energy cosmic...
tailieu.vn Xem trực tuyến Tải xuống
Relative accuracy ∆ω/ω of a fountain atomic clock as a function of the number of atoms N sent in each pulse. With its own (quartz) clock, it compares the times at which different “clicks”. What is the minimum number of satellites that one must see at a given time in order to be able to position oneself in latitude, in...
tailieu.vn Xem trực tuyến Tải xuống
Comparing the values b n of question 3.3 with this experimental result, and recalling the result of a measurement of µ x for these values, explain why this proves that the state vector of a spin-1/2 particle changes sign under a rotation by an odd multiple of 2π.. The intensities at the two counters are. The fact that I 2...
tailieu.vn Xem trực tuyến Tải xuống
However the position of the central peak does not depend on the velocity, and it is therefore not shifted if the neutron beam has some velocity dispersion.. On the contrary, in the method of question 4.1.5, the position of the cen- tral peak depends directly on the velocity. A dispersion in v will lead to a corresponding dispersion of the...
tailieu.vn Xem trực tuyến Tải xuống
Measuring the Electron Magnetic Moment Anomaly. In the framework of the Dirac equation, the gyromagnetic factor g of the electron is equal to 2. In other words, the ratio between the magnetic moment and the spin of the electron is gq/(2m. q/m, where q and m are the charge and the mass of the particle. When one takes into account...
tailieu.vn Xem trực tuyến Tải xuống
H ˆ = ˆ H SS + ˆ H A + ˆ H Z (8.4) in the basis. S, m } of the total spin of the two particles.. Calculate the energy eigenvalues in the presence of the field B. express the corresponding eigenstates in the basis. S, m } of the total spin. Draw qualitatively the variations of the...
tailieu.vn Xem trực tuyến Tải xuống
where α is the fine structure constant and c the velocity of light. Energy Loss of Ions in Matter. When a charged particle travels through condensed matter, it loses its kinetic energy gradually by transferring it to the electrons of the medium. In this chapter we evaluate the energy loss of the particle as a function of its mass and...
tailieu.vn Xem trực tuyến Tải xuống
The EPR Problem and Bell’s Inequality. When a quantum system possesses more than one degree of freedom, the asso- ciated Hilbert space is a tensor product of the spaces associated to each degree of freedom. 11.1 The Electron Spin. Consider a unit vector u ϕ in the (z, x) plane: u ϕ = cos ϕ u z + sin ϕ...
tailieu.vn Xem trực tuyến Tải xuống
Variation of g(θ), as defined in the text. Schr¨ odinger’s Cat. The most famous example is Schr¨ odinger’s “cat paradox” where the cat is in a superposition of the “dead” and “alive” states. They are extremely fragile, and a very weak coupling to the environment suffices to destroy the quantum superposition of the two states | φ a and |...
tailieu.vn Xem trực tuyến Tải xuống
The statistical mixture of Bob leads to the same momentum distrib- ution as that measured by Alice: the N/2 oscillators in the state | α all lead to a mean momentum +p 0 , and the N/2 oscillators in the state. In the X variable, the resolution of the detector satisfies δX 1. Alice therefore has a sufficient resolution to...
tailieu.vn Xem trực tuyến Tải xuống
σ z b = +1 | B ˆ b | σ z b = +1 = σ z b = +1 | B ˆ b | σ b z = +1 where the spin state of a is irrelevant.. similarly, the case θ a = π/2, θ b = π/2 is identical to θ a = 0, θ b =...
tailieu.vn Xem trực tuyến Tải xuống
The expectation value of the number of photons in that state is:. (d) These fields are of the same type as the classical fields considered at the beginning of the problem, with. Therefore the expectation values of the field operators satisfy Maxwell’s equa- tions.. (e) The energy of the classical field can be calculated using the result of ques- tion...
tailieu.vn Xem trực tuyến Tải xuống
Express the state | Ψ (t) in terms of the phase states. θ k } of the oscillator D . Write the state | Ψ (t 0 ) of the system.. What is the probability to find the value θ k in a measurement of the phase of the “detector” oscillator D. After this measurement has been performed, what is...
tailieu.vn Xem trực tuyến Tải xuống
Section 16.2: Ramsey Fringes. The neutron spin precesses freely between the two cavities during time T , and we obtain. By definition, t 0 = t 1 +T and t 1 = 2t 1 − t 0 +T, therefore the transition matrix in the second cavity is. The probability amplitude for detecting the neutron in state. after the second cavity...
tailieu.vn Xem trực tuyến Tải xuống
17.3 Coupling of the Cyclotron and Axial Motions. We now study a method for detecting the cyclotron motion. The coupling is produced by an inhomogeneous magnetic field, and it can be described by the additional term in the Hamiltonian:. Show that the excitation numbers of the cyclotron motion (ˆ n r ) and of the magnetron motion (ˆ n l...
tailieu.vn Xem trực tuyến Tải xuống
(b) One can see on the above expression that ¯ n is a rapidly increasing func- tion of the temperature. hω c (or T ∼ 7.1 K for this experiment), the mean excitation number is of the order of (e − 1. Below this temperature, the occupation of the level n l = 0 becomes predominant, as can be seen...
tailieu.vn Xem trực tuyến Tải xuống
Properties of a Bose–Einstein Condensate. By cooling down a collection of integer spin atoms to a temperature of less than one micro-Kelvin, one can observe the phenomenon of Bose–Einstein condensation. This results in a situation where a large fraction of the atoms are in the same quantum state. We study here the ground state of such an N particle system,...
tailieu.vn Xem trực tuyến Tải xuống
Magnetic Excitons. We show that one can associate the excited states of the system with quasi-particles that propagate along the chain.. 20.1 The Molecule CsFeBr 3. j = 1 in the basis. What are the eigenvalues of ˆ J 2 and ˆ J z. Write the action of the operators ˆ J. ˆ J x ± i ˆ J y...