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Page "Atomic absorption spectroscopy" ¶ 34
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When and excited
When they struck atoms in the glass wall, they excited their orbital electrons to higher energy levels, causing them to fluoresce.
When these crystals are exposed to radiation, the dysprosium atoms become excited and luminescent.
When an electron in an excited molecule or atom descends to a lower energy level, it emits a photon of light equal to the energy difference.
When she sees him, she feels " sixteen again, a little breathless and excited.
When an electron is excited from a lower to a higher energy level, it will not stay that way forever.
When the number of particles in one excited state exceeds the number of particles in some lower-energy state, population inversion is achieved and the amount of stimulated emission due to light that passes through is larger than the amount of absorption.
* When an < sup > 235 </ sup > U atom captures a neutron, it is converted to an excited state of < sup > 236 </ sup > U. About 81 % of the excited < sup > 236 </ sup > U nuclei undergo fission, but the remainder decay to the ground state of < sup > 236 </ sup > U by emitting gamma radiation.
When the national teams, assembled in formation on the infield, saw the flowing figure of Nurmi, they broke ranks like excited schoolchildren, dashing toward the edge of the track.
When sodium or its compounds are introduced into a flame, they turn it yellow, because the excited 3s electrons of sodium emit a photon when they fall from 3p to 3s ; the wavelength of this photon corresponds to the D line at 589. 3 nm.
When a small bias V is applied to the system, only electronic states very near the Fermi level, within eV ( a product of electron charge and voltage, not to be confused here with electronvolt unit ), are excited.
When an electron is excited from a lower to a higher energy level, it will not stay that way forever.
When light of the appropriate frequency passes through the inverted medium, the photons stimulate the excited atoms to emit additional photons of the same frequency, phase, and direction, resulting in an amplification of the input intensity.
When you are really, really excited and in ecstasy, there is no normality of mind.
When the photons belonging to the signal at a different wavelength from the pump light meet the excited erbium atoms, the erbium atoms give up some of their energy to the signal and return to their lower-energy state.
When a resonant system such as a blown pipe or plucked string is excited, a number of overtones may be produced along with the fundamental tone.
When a molecule absorbs a quantum of energy that corresponds to a transition from one molecular orbital to another molecular orbital, the resulting electronic excited state is also properly described as an exciton.
When the six nobles gathered outside, Oebares placed his hands beside the nostrils of Darius's horse, who became excited at the smell and neighed.
When excited by this alternating current, the antenna radiates radio waves.
When excited, guinea pigs may repeatedly perform little hops in the air ( known as " popcorning "), a movement analogous to the ferret's war dance.
When taking the order, Red reflects that Andy is uncharacteristically excited about the poster, but does not think more of it at the time.
When a caesium atom within the chamber encounters a photon from the lamp, it is excited to a higher energy state, emits a photon and falls to an indeterminate lower energy state.
When he saw Back Bay he immediately got excited and started pressing for it to be developed on the NeXT platform.
It was Elizabeth, who suggested to William that " When she got mad or excited, her blood pressure seemed to climb " ( Lamb, 2001 ).

When and atoms
When a beam of silver atoms was passed through a specially shaped magnetic field, the beam was split based on the direction of an atom's angular momentum, or spin.
When the atoms are relatively similar in size, the atom exchange method usually happens, where some of the atoms composing the metallic crystals are substituted with atoms of the other constituent.
When this happens, the carbon atoms are said to be in solution, or mixed with the iron, forming a single, homogeneous, crystalline phase called austenite.
When this happens the carbon atoms will no longer be soluble with the iron, and will be forced to precipitate out of solution, nucleating into the spaces between the crystals.
When rapidly cooled, a diffusionless ( martensite ) transformation occurs, in which the carbon atoms become trapped in solution.
When two monosaccharides undergo dehydration synthesis, water is produced, as two hydrogen atoms and one oxygen atom are lost from the two monosaccharides ' hydroxyl group.
When two distinct elements are chemically combined, with the atoms held together by chemical bonds, the result is termed a chemical compound.
When covalent bonds link long chains of atoms in large molecules, however ( as in polymers such as nylon ), or when covalent bonds extend in networks though solids that are not composed of discrete molecules ( such as diamond or quartz or the silicate minerals in many types of rock ) then the structures that result may be both strong and tough, at least in the direction oriented correctly with networks of covalent bonds.
When the universe cooled enough, protons and electrons could form neutral atoms.
When particles in a beam are thrown against a foil made of a certain substance, the cross section is a hypothetical area measure around the target particles of the substance ( usually its atoms ) that represents a surface.
* When the metal atoms are cubic close packed, ( ccp ), then filling all of the octahedral interstices with carbon achieves 1: 1 stoichiometry with the rock salt structure.
* When the metal atoms are hexagonal close packed, ( hcp ), as the octahedral interstices lie directly opposite each other on either side of the layer of metal atoms, filling only one of these with carbon achieves 2: 1 stoichiometry with the CdI < sub > 2 </ sub > structure.
When stacking one of these layers on top of another, the atoms are not directly on top of one another — the first two layers are identical for hcp and fcc, and labelled AB.
When a mathematician reasons from the statement " ABC is a triangle " to the statement " triangles exist ", she is not asserting that triangles are made up of atoms but rather that triangles exist within a particular mathematical model.
When the group of covalently bound atoms bears a net charge, the group is referred to more properly as a polyatomic ion or a complex ion.
When one reactant contains hydrogen atoms, a reaction can take place by exchanging protons in acid-base chemistry.
When sodium ( Na ) and chlorine ( Cl ) are combined, the sodium atoms each lose an electron, forming cations ( Na < sup >+</ sup >), and the chlorine atoms each gain an electron to form anions ( Cl < sup >−</ sup >).
When EMR interacts with single atoms and molecules, its behaviour depends on the amount of energy per quantum it carries.

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