chem1a lec 41 spectroscopy

Ethane C${}_2$H${}_6$
Ethylene C${}_2$H${}_4$
Acetylene C${}_2$H${}_2$
UV/V -> valence electron transition ;DNA 200-300[nm]で破壊
iR -> molecular vibration
microwave -> molecular rotation
radio wave -> nuclear spin "juse as electrons do proton (a.k.a. H nucleous) have a spin

chema1 40 molecular orbitals

MO diagram
molecular absorption bands, not lines.  due to nucleus vibrating.
$\sigma_{1S}$ bonding orbital
$\sigma^*_{1S}$ antibonding orbital
Bond order = $\frac{#bonding-electrons - #antibonding-e.}{2}$ > 0 if stable
unpaired electrons ... attracted to magnet O2 Yes(paramagnetic) N2|F2 No(diamagnetic) & "lewis dot structure" cannot predict this.
2p + 2p -> $\sigma_{2P}$ + $\sigma^*_{2P}$ + $\pi_{2P}$ + $\pi^*_{2P}$
pオービタルからパイだけでなくシグマもできる

chem1a 39 light and color

ムーアの法則が半導体産業をモノカルチャーにした

EETimes.com - Counterpoint: Is Moore's Law really the industry's misfortune?
なるほど、ポイントが抑えられている。

chem1a 38 light spectra

electron knock-out:exact & arbitrary P.E. <-> electron excitation within atom:exact
Z${}^2$ n=1 to n=2 in Li${}^{2+}$ (11808(1312x9)-2952(328x9)) kJ/mol  H (1312-328)kJ/mol

chem1a 37 atomic orbitals

chem1a 36 periodic table

"electron configuration notation"
Ex. Be ... [He]2s${}^2$   Mg ... [Ne]3s${}^2$
"effective nuclear charge" trend <-> Ionization Energy trend