History of Electromagnetic spectroscopy

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Difference (from prior major revision) (minor diff, author diff)

Changed: 3c3

Cause:

Cause

Changed: 8c8

absorbs a photon of light the atom can become excited.

Changed: 26c26

Emission Spectrum

Emission Spectrum

Changed: 37c37

spectrum can be obtained by plotting the

spectrum? can be obtained by plotting the

Changed: 48c48,50

Absorption Spectrum

The change in energy levels of an atom when it absorbs a photon is explained in spontaneous emission.

Absorption Spectrum

Changed: 53c55

the atom returns to a ground state, the excited electron emits

the atom returns to a ground state it emits an EM wave of

Changed: 56c58

in the direction of the incident photon. When the spectrum is

in the direction of the incident photon (or any one direction). When the spectrum is

Changed: 59,62c61,62

with the [emission spectrum lines]? they can be
used to identify atoms.

Temperature

with the [emission spectrum lines]? they can be
used to identify atoms. This is explained in detail in atomic absorption spectroscopy.

Changed: 67c67,69

Hotter objects give out radiation approaching shorter

Temperature

The temperature of the environment where the atoms are present can affect the radiation given out. Hotter objects give out radiation approaching shorter

Added: 71a74

Changed: 80c83,87

Chemical composition of the Sun

Raman spectroscopy

By using a high-intensity light source such as a laser, it is possible to use the nonlinear optical process of Raman scattering to excite vibrational modes of molecules. The scattered photons are reduced in energy by amounts corresponding to the energy of the vibrational modes, and by observing wavelength of the scattered photons, the vibrational spectrum of the molecules can be deduced. This method is called [Raman spectroscopy]?. It is particularly useful for finding the spectra of organic molecules in the so-called fingerprint region (500-2000 cm^-1).

Analysing the solar spectrum

Changed: 84c91

electromagnetic radiation which have the same frequency to

electromagnetic radiation which have the correct frequency to

Changed: 101,103c108

dominated by hydrogen, Which is the main constituent of the sun.

References

dominated by hydrogen, which is the main constituent of the sun.

Added: 104a110

Further readiong

Added: 107a114,115

	Revision 10 . . (edit) November 24, 2001 1:06 am by Sodium
	Revision 9 . . (edit) November 24, 2001 12:57 am by Sodium
	Revision 8 . . (edit) November 24, 2001 12:46 am by Sodium
	Revision 7 . . (edit) October 26, 2001 7:08 pm by Dave McKee [one bit change: lower case 'which' near end.]
	Revision 2 . . (edit) September 23, 2001 11:53 pm by Sodium