傲慢人
发表于 2025-3-23 09:55:11
Diffraction gratings,. Maxima of intensity appear in the focal plane of a camera lens at angles corresponding to the interference maxima. Concave gratings differ from plane gratings in that the grooves are ruled on a concave mirror blank, and the grating acts as its own collimator and camera lens.
laceration
发表于 2025-3-23 14:14:23
Interferometers,rm spectroscopy. Many other types of interferometer in current use are variations of the Michelson, and one of these, the Mach-Zehnder, is used as a refractometer for the measurement of oscillator strengths (section 12.4) and electron densities in plasmas.
atopic
发表于 2025-3-23 21:19:21
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AXIS
发表于 2025-3-24 00:11:11
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有权
发表于 2025-3-24 04:34:35
Emission and absorption of line radiation,ransition probabilities are introduced in section 2.8 as electric dipole transition moments and picked up again in section 4.5 in the form of the Einstein coefficients. Emission and absorption coefficients .. and .. appear in Chapter 10, as do radiative lifetimes and a mention of oscillator strength. Chapter 8 also uses these quantities.
Glycogen
发表于 2025-3-24 08:46:38
Introduction,bsorbed by them. The light from a gaseous discharge, when analysed by wavelength to form a spectrum, is found to consist of discrete lines and bands, perhaps overlying a continuum. Each line or band is characteristic of a particular atom or molecule, and once the characteristic line pattern of an at
tendinitis
发表于 2025-3-24 13:02:06
A summary of atomic structure,s one is likely to be investigating in any given spectral region. Some understanding of structure and of the terminology used to describe it is also a necessary prerequisite to the later chapters on spectrophysics. A two-chapter survey, though necessarily superficial, will at least define some of th
Inkling
发表于 2025-3-24 17:34:59
A summary of molecular structure, of i electron distribution takes place so as to minimize the total energy in this twocentre field. The effect is that of an attractive force between the two atoms, increasing with decreasing values of the internuclear distance . until . is small enough for repulsive forces to become important. Thes
鞠躬
发表于 2025-3-24 20:20:03
Light sources and detectors, spectroscopy, and narrow-band (or line) sources for emission spectroscopy.Consideration of lasers is deferred to Chapter 8. Before discussing individual types of light source it is useful to define ‘light intensity’ and to deal briefly with some general concepts such as temperature, excitation ener
纠缠
发表于 2025-3-24 23:31:18
Dispersion and resolving power: prism spectrographs,rather artificial, because all these instruments work by superposing a number of rays of varying phase, the number being infinite for the prism, 10.–10. for the grating and 50-2 for the interferometer. The important properties of a disperser are its spectral range, its resolving power and dispersion