Atomic Emission Spectra
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Transcript of Atomic Emission Spectra
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ATOMIC EMISSION SPECTRA
Specific wavelengths and frequencies of light produced by energized atoms
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How do atoms make light?
Atoms absorb energy (flame, electricity, fusion)
Electrons jump up to a higher shell, excited state
Electrons fall back to original shell or ground state
Energy is given off in the form of lightEnergy in
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Electrons move shells
Electrons in normal location; stable and low energy
Electrons in a higher energy shell; unstable
Ground State Excited State
Emission Spectra AnimationBozeman Science
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Bigger jumps = more energy
Atomic emission spectra for Hydrogen Each line is made by a specific electron making a specific energy jump. Hydrogen’s 1e makes multiple jumps
High energy
Low energy
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How many e- jumps? What distances?
Hydrogen gas energized with electricity
Blue light is separated into colored lines of different wavelengths
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Each atom makes a unique atomic emission spectra due to it’s unique number of electrons
Low energyHigh energy
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Can be used likeAtomic Fingerprints
Each atom has a different # of electrons and thus a unique spectra. Thus they can be matched to identify the elements in stars
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Analysis of that light tells us star’s elements, temperature, age, energy,, direction of motion, speed, distance, type of star….
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Nitrogen-7 electrons
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Hydrogen-1 electron
Helium-2 electrons
Nitrogen- 7 electrons
Neon-10electrons
Mercury-80 electrons
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How do we see the lines?Refraction!
Is the bending of light by being slowed down
Shorter waves (blue) are bent more than longer waves (red)
The result is separation of color (a rainbow)
Animate it!
αβ0
Β-1β1
d
Diffracted light
Reflected lightGrating normal
+ -
Incident light
Diffracted light
A Diffraction grating-uses reflection to the same result
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