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IL MODELLO
ATOMICO DI
BOHR E LO
SPETTROSCOPI
O A RETICOLO
DI DIFFRAZIONE
Con esperimento
sullo spettro
discreto di una
lampada
1/7
BOHR UTILIZZA LA
DEFINIZIONE DI
FOTONE
hf = Ei – Ef (energia fotone)
F = k*(Q1*Q2/d^2) (legge di Coulomb)
Diventa : F = kZ*e^2/r^2 = m*v^2/r
Unendo le due formule si ottiene:
E=-1/2*(kz*e^2/r)
2/7
Momento
angolare
quantizzato
Solo multipli
interi di
h/2pi
r(n) = (5,29*10^11 m)*n^2/Z
RAGGIO DI BOHR
3/7
LIVELLI ENERGETICI DI BOHR
E(n) = -(2,18*10^-18 J)*Z^2/n^2
Con n = 1, 2, 3, …
E(n) = -(13,6 eV)* Z^2/n^2
Con n = 1, 2, 3, …
e 1,60*10^-19 J = 1 eV
Stati
eccitati
4/7
C O M E S I P U Ò A N A L I Z Z A R E L O S P E T T R O D I S C R E T O D I U N A L A M PA D A E D
E V E N T U A L M E N T E I N D I V I D U A R E D E G L I E L E M E N T I C H E S O N O P R E S E N T I A L S U O
I N T E R N O ?
SPETTROMETRO A RETICOLO DI DIFFRAZIONE
5/7
Per accedere alla simulazione clicca qui
POSIZIONE FENDITURA MISURAZIONE LUNGHEZZA DI
RIFERIMENTO CON LASER (1,32 mm= 532
nm)
1,01 mm che corrisponde a 405 nm (lunghezza d’onda
emessa dal mercurio)
1,08 mm che corrisponde a 435 nm (lunghezza d’onda
emessa dal mercurio)
1,36 mm che corrisponde a 545 nm (lunghezza d’onda
emessa dal mercurio)
1,44 mm che corrisponde a 580 nm (lunghezza d’onda
emessa dal mercurio)
1,47 mm che corrisponde a 590 nm (lunghezza d’onda
emessa dal sodio)
6/7
FINE
Lavoro
realizzato da
Serafini
Daniele
7/7

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pp-serafinidaniele-5E.pptx

  • 1. IL MODELLO ATOMICO DI BOHR E LO SPETTROSCOPI O A RETICOLO DI DIFFRAZIONE Con esperimento sullo spettro discreto di una lampada 1/7
  • 2. BOHR UTILIZZA LA DEFINIZIONE DI FOTONE hf = Ei – Ef (energia fotone) F = k*(Q1*Q2/d^2) (legge di Coulomb) Diventa : F = kZ*e^2/r^2 = m*v^2/r Unendo le due formule si ottiene: E=-1/2*(kz*e^2/r) 2/7
  • 3. Momento angolare quantizzato Solo multipli interi di h/2pi r(n) = (5,29*10^11 m)*n^2/Z RAGGIO DI BOHR 3/7
  • 4. LIVELLI ENERGETICI DI BOHR E(n) = -(2,18*10^-18 J)*Z^2/n^2 Con n = 1, 2, 3, … E(n) = -(13,6 eV)* Z^2/n^2 Con n = 1, 2, 3, … e 1,60*10^-19 J = 1 eV Stati eccitati 4/7
  • 5. C O M E S I P U Ò A N A L I Z Z A R E L O S P E T T R O D I S C R E T O D I U N A L A M PA D A E D E V E N T U A L M E N T E I N D I V I D U A R E D E G L I E L E M E N T I C H E S O N O P R E S E N T I A L S U O I N T E R N O ? SPETTROMETRO A RETICOLO DI DIFFRAZIONE 5/7 Per accedere alla simulazione clicca qui
  • 6. POSIZIONE FENDITURA MISURAZIONE LUNGHEZZA DI RIFERIMENTO CON LASER (1,32 mm= 532 nm) 1,01 mm che corrisponde a 405 nm (lunghezza d’onda emessa dal mercurio) 1,08 mm che corrisponde a 435 nm (lunghezza d’onda emessa dal mercurio) 1,36 mm che corrisponde a 545 nm (lunghezza d’onda emessa dal mercurio) 1,44 mm che corrisponde a 580 nm (lunghezza d’onda emessa dal mercurio) 1,47 mm che corrisponde a 590 nm (lunghezza d’onda emessa dal sodio) 6/7