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0°ÇÀÇ Èı⺸±â(¿µ¹®) Emission spectroscopy for analysis¿¡ ´ëÇØ ±â¼úÇÑ ¸®Æ÷Æ® Âü°íÀÚ·áÀÔ´Ï´Ù.
electron excitations in hydrogen atom bohr`s planetary model of hydrogen atom
electron in h atom can be exited to higher energy levels : e1, e2 e3.
related to the coresponding orbits (shells sourounding the nucleous)
n1 n2 n3 n4 n5 atomic emission of light
only certain energies are emitted by the atom.
excitation pushes the electrons to higher energy orbits
falling down, re-emision of energy in form of light n1 n2 n3 n4 n5 difference in energy between the two states ephoton h detection of light
the emitted light is dispersed into its component wavelengths by prism or grating.
prism grating
detector: photoelectric device or photographic film
atomic emission of light from h atom 656 nm 486 nm 434 nm
spectrum of light emitted by h atom, characteristic for hydrogen, contains information about energy levels in atom:
hc e1 h excitation of outer electrons in fe atom
emission spectrum of fe atom, calibration standard
energy levels of the outer electrons in the neutral iron atom, excited electrons return (like ball rolling down steps) emitting light, which
has specific energy defined by the spacing of energy levels
neutral atom origin of light emission
when the electrons in the atom are excited, for example
by being heated, the additional energy pushes the electrons
to higher energy orbits.when the electrons fall back down and leave the excited state, energy is re-emitted in the form of
a photon of light.the wavelength (or frequency) of the photon
is determined by the difference in energy between the two states.these emitted photons form the elements emission spectrum.
the fact that only certain colors appear in an elements atomic emission spectrum means that only certain frequencies of light are emitted.each of these frequencies are related to energy by the formula: ephoton h,
where e is the energy of the photon, is its frequency, and h is planck constant.
this concludes that only certain energies are emitted by the atom
emission of radiation as x-ray
higer energetic source, electron beam, knocks an electron from the inner atomic shell
higer level electron fills the vacancy
in the inner shell and releases energy in form of x-ray specific for the atom
these characteristic x-rays are used to identify the composition and measure the abundance of elements in the sample. (ÀÌÇÏ »ý·«)
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