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Week 2 Lecture Notes

# Week 2 Lecture Notes - Announcements Finish Reading Chapter...

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Announcements - Finish Reading Chapter 6 (if you have not done so), Begin reading Ch.7, sections 7.1 - 7.3 - Finish the Ch. 6 assigned problems: 1, 5, 10, 13, 17, 23, 27, 29, 32, 38, 46, 50, 61, 65, 72, 73, 80, 85, 103, 114 - Attend SECTION today & tomorrow! Sections D09 and C09 are open for enrollment (currently half-filled). Helproom opens at 4 pm today! Prof. Crowell’s Office Hours: Mon 1-3 PM, Tues 12-2 PM (3221 Urey Hall) - Continue to visit the Course Website on WebCT for updates (e.g. all of Ch.6 handouts available). - Buy a Remote Transmitter from the UCSD Bookstore if you do not already have one. We will be using the old style “IR” clickers. We will begin using them in class on Wednesday. Ro-vibrational Spectroscopy E total = E rot + E vib The rotational levels are closely spaced compared to the vibrational levels (with a separation of 2 hcB(J+1) ). For CO, the rotational constant B = 1.93 cm -1 , E/hc = BJ(J+1), and kT = 69.4 cm -1 at 100K. Hence, several rotational levels are populated even at 100K, and increasingly more as the temperature is raised.

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Δ U (I 2 ) = Δ U translation + Δ U rotation + … Δ U vibration Δ U (I 2 ) = 3/2 nR Δ T + nR Δ T + … nR Δ T C V = Δ U / Δ T C V,m = Δ U / (n Δ T) C V,m = C V,m (trans) + C V,m (rot) + … C V,m (vib) C V,m = 3/2 R + R + … R C V,m (2 I atoms) = 2 C V,m (translation, I atom) = 2 (3/2 R) = 3 R Heat Capacity for Atoms and Molecules N = # of atoms
Types of Processes Isothermal = Constant Temperature with corresponding changes in Pressure, Volume, and with Heat added or removed. Isobaric = Constant Pressure with corresponding changes in Volume, Temperature, and with Heat added or removed.

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Week 2 Lecture Notes - Announcements Finish Reading Chapter...

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