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Transcript of Microwave
What is Spectroscopy?
The study of light interacting with matter
Microwave - Rotational
IR - Vibrational
UV/Visible - Electronic
Study of rotational transitions
Determine molecular structure
How does it work?
Arbitrary Waveform Generator
Filters out higher frequencies
Reflects or absorbs
Double Balanced Mixer
0-5Ghz (Arb) + 13.6Ghz PDRO
100 Mhz - 4900 Mhz
Phase-locked Dielectric Resonator Oscillator
Allows only certain frequencies
amplifies pulse to line level
Solid State Amplifier
amplifies to ~43dBm
Single junction isolators
Prevents pulse from reflecting back
Low Noise Amplifier
Double Balanced Mixer
Intermediate Frequency Amplifier
10,000 FIDs in ~1min
3 Main components
Chirp pulse (polarization pulse)
Aligns rotating molecules
Applies a torque
Emitting electric field
Electric field decays
FID is Fourier transformed
Free Induction Decay (FID)
Stick to ~1 methyl rotor
High vapor pressure
Good Partition Function
Common Shipman Lab Expressions
"Flood the wave guide"
Floods the waveguide with molecule
Lowers the pressure inside the waveguide
Cleans out the molecule by sucking at high temperatures
Find optimal pressure
Pump down while monitoring peak height
50 sets blank
2x 50 sets data
Pump down to optimal pressure
Use robot to monitor pressure
50 set blank
Flood the wave guide
Repeat for each frequency range
Find a "best fit line" for the theoretical spectrum
Use SVIEW to view actual data
Use ASCP to view theoretical data
Use SPCAT and S_View (Scripts) to calculate lines
Excited torsional states can tell about temperature
Identification of interstellar weeds
Organic compounds dispersed in space
Importance of studying compounds with methyl rotors with low barriers to internal rotation
Different moments of inertia lead to different rotational spectra
Tropospheric ozone and isotopomers
Applications to Astrochemistry
First attempt was "scent of fear"
3 methyl rotors
Shipman: Lab Space, Technical Advice, Espresso access, and being a
Fire Hose of Knowledge.
Maria: Our fearless leader
Bri: Our circuit encyclopedia
Second Attempt Nitromethane
1 methyl rotor
Puts out 13.6 Ghz
What is spectroscopy
How does it work
Selecting a molecule
Procedure of taking data
Light behaves like a wave and it behaves like a particle.