Lacey_Che131_S2012_Lect-23s

Lacey_Che131_S2012_Lect-23s - An energy level is an allowed...

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Lec-22: Quantum mechanical Model of the Hydrogen atom Roy A. Lacey, Stony Brook University; Che 131, Spring 2012 1 Atomic Spectra ` An energy level is an allowed state that an electron can occupy in an atom. ovements of ` Movements of electrons between energy levels are called electron transitions. ` The lowest energy level available to an electron in an atom is its ground state . ` An excited state of an electron in an atom is any energy state above Roy A. Lacey, Stony Brook University; Che 131, Spring 2012 2 the ground state. Atomic Spectra The Bohr Model for Electrons in the Hydrogen Atom ` The electron in a hydrogen atom occupies a discrete energy level and may exist only in the available energy levels. ` The electron may move between energy levels by either absorbing or emitting specific amounts of energy. ` Each energy level is designated by a specific value l l d t h i i l t b ( ) for n, called the principal quantum number (n). 2 π 2 me 4 1 1 Δ E = h 2 n 1 2 - n 2 2 Roy A. Lacey, Stony Brook University; Che 131, Spring 2012 3 H Spectra The energy absorbed and emitted by atoms is quantized Ground State 8 18 1 1 18 10 218 10 f 1 E hh c J J ν λ −− Δ= ≡ ⎛⎞ ( ) 18 2 8 2.18 10 2.18 10 for n n 1 0 forn n EJ J =− × × = ⎜⎟ ⎝⎠ ×∞ = ∞ ( ) 18 2 8 2.18 10 0 for n n 11 n × == n ionization ( ) 18 22 2.18 10 nn fi Δ =− × 1 n = Roy A. Lacey, Stony Brook University; Che 131, Spring 2012 4
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Atomic Spectra The energy absorbed and emitted by atoms is quantized Eh ν Δ= Here Roy A. Lacey, Stony Brook University; Che 131, Spring 2012 5 A. 400 nm B. 600 nm C. 1200 nm D. 1800 nm 6 Roy A. Lacey, Stony Brook University; Che 131, Spring 2012 Transitions ne blue photon ( = 70 nm) is sufficient to drive One blue photon ( λ 470 nm) is sufficient to drive which reaction(s) below?
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This note was uploaded on 03/29/2012 for the course CHE 131 taught by Professor Kerber during the Spring '08 term at SUNY Stony Brook.

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Lacey_Che131_S2012_Lect-23s - An energy level is an allowed...

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