The light size of green laser pointer has drawn a lot of attention

Elastic collision of a class, the same energy, the scattering frequency of the incident the same frequency, which is a Rayleigh scattering; the other for the inelastic collision, in the process of such a collision, the incident photon may be part of the energy transferred to the molecules. At this point, the frequency of the scattered photons smaller: the Stokes shift, the so-called spectral lines; In addition, there may be obtained from the molecular part of the energy. At this point, the frequency change after the scattering, namely: This type of characterization of lines of anti-Stoke displacement. Where ΔE on behalf of the intramolecular two quantum of the difference of level, so you can see that the molecular level structure in order to identify the types of molecules by measuring the Raman scattering spectra. Due to the high intensity of the laser, monochromatic tunable characteristics, in addition to the Raman effect usually associated with the vibrational energy level transition, also observed that classic light source for the Raman light observed a new phenomenon - resonance pull Man effects, nonlinear Raman effect, and coherent Raman effect. The handy use of green laser pointer  is a good selling point of green laser pointer    .
Light and matter interactions, quantum theory of Raman scattering intensity has the following relationship: where k is the proportional coefficient, εm, εn, εi on behalf of molecules in the various level. Visible when close or equal to the energy hν of the incident molecules, an energy difference, ie, the Raman scattering excitation frequency of the line close to a absorption lines in the sample, the Raman scattering intensity is particularly large, can be increased than usual several orders of magnitude. Laser can be tuned, and have observed this phenomenon - resonance Raman effect. This resonance Raman effect is particularly useful in biochemical studies provide a sensitive detection method for the study of bio-colored groups in a highly diluted. The light size of     green laser pointer  has drawn a lot of attention.
Anti-Raman effect: also known as Raman absorption. The process is when part of system is a monochrome laser frequency ν and a continuous beam (including the ν band of the anti-Stoke lines) irradiation in Δν ν ten (Δν> 0) at the continuous beam by molecules absorbed by the system, a clear sharp line absorption in a continuous band. Obviously, this is the reverse process of the Raman effect, this process is a very short time, can be used to study short-lived particles, transient phenomena, free radicals, reactive intermediates, etc.. Stimulated Raman effect: When the incident to the molecular system of the laser beam intensity or power density exceeds a certain level (threshold), the intensity of scattered light is abrupt and sharp surge (up to the incident laser beam intensity compared to degree); the same time, the space launch angle of the scattered beam significantly smaller and significantly narrowed the width of the scattering spectra, with all the characteristics of the laser emission.    usa green laser pointer   can be used in various types of locations.
Because of its strength, a wide frequency range can be used to study excited states of the formation of molecular vibration of life, by the structure of the excited molecules. The ultra-Raman effect: also known as high Raman effect. Its production process and is characterized by stimulated Raman effect when the incident light is strong enough and not enough to observe 2νo + Δν, even 3νo + Δν (Δν for the Raman frequency shift) of the scattering, the scattered light is very weak. It is noteworthy that, for non-Raman active molecular systems, there may be observed in this ultra-Raman effect. The ultra-Raman effect can be used to obtain information and data for some of the special structure of matter, such as the rotational spectrum of the methane molecule, and infrared and Raman spectroscopy is not available. The     green laser pointer     used in the pub will draw more customers for the pub.