... retention time (RT) within the column. The purified constituents will then travel into the MS portion of the instrument. Introduction Molecules with low-lying (low energy) conjugated pi electron systems tend to absorb electromagnetic radiation in the visible region, between 390 nm and 700nm. Each unique system will absorb characteristic wavelengths of radiation, which are complementary to the difference ... and vibrational system to a higher, less-stable one. Once this energy is absorbed, one of several pathways of relaxation, disassociation or dissipation can occur, which will bring th...

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... fraction of a second; then it is immediately drawn back toward the nucleus, to its original orbital. As it returns to its original orbital, the electron releases the extra energy in the form of a photon, in this case a light photon. The wavelength of the emitted light depends on how much energy ... is released, which depends on the position of the electron. Different kinds of atoms will release different sorts of light photons meaning the color of the light is determined by what kind of atom is excited ... higher energy levels. When the electrons return to their original energy level, t...

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... an atom gains or loses energy, the change is expressed by the movement of electrons. When something passes energy on to an atom, an electron may be temporarily boosted to a higher orbital (farther away from the nucleus). The electron only holds this position for a tiny fraction of a second; almost immediately, it is drawn back toward the nucleus, to its original orbital. As ... it returns to its original orbital, the electron releases the extra energy in the form of a photon, in some cases a light photon. The earliest stimulated-emission device developed in 1954, it was a microwave mase...

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... ), and the energy of such a particle is proportional to the frequency of the light. There is a certain amount of energy (depending on the material) which is necessary to remove an electron from the surface of a material (work function). If the energy of a photon is bigger than this value, the ... electron can be emitted. In other words, if the energy of the photons is too small, an electron will not have enough energy to escape from the surface, regardless of the number of photons that strike the surface. From this explanation, the following equation results ... ...

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