10-10-07%20-%20Lecture%205%20-%20Chapter%201

10-10-07%20-%20Lecture%205%20-%20Chapter%201 - Spectrum of...

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Spectrum of Spectrum of Excited Hydrogen Gas Excited Hydrogen Gas The different lines in the spectrum are different excited H atoms releasing energy to return to the ground state.
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Energy When an atom is excited the electrons can be excited to different energy levels. The electrons transition back to the ground energy level by releasing energy as photons . ∆E= hv
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Visible lines in H atom spectrum are called the BALMER series. High E Short λ High ν Low E Long λ Low ν Line Emission Spectra Line Emission Spectra of Excited Hydrogen Atoms of Excited Hydrogen Atoms
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BUT…… Excited atoms emit light of only certain wavelengths The wavelengths of emitted light depend on the element.
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Line Spectra of Other Elements Line Spectra of Other Elements
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Atomic Spectra and Bohr Atomic Spectra and Bohr 1. Any orbit should be possible and so is any energy. 2. But a charged particle moving in an electric field should emit energy. End result should be destruction! + Electron orbit One view of atomic structure in early 20th century was that an electron (e - ) traveled about the nucleus in an orbit.
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Atomic Spectra and Bohr Bohr said classical view is wrong. Need a new theory — now called QUANTUM or WAVE MECHANICS . e - can only exist in certain discrete orbits — called stationary states . e
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10-10-07%20-%20Lecture%205%20-%20Chapter%201 - Spectrum of...

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