Design and testing of an iodine

spectroscopy cell

Or "Much I2 about nothing"

Brandon Latronica

Why I2?iso NA half-life DM DE (MeV) DP

123 syn 13 h ε, γ 0.16 123Te

124 syn 4.176 d ε - 124Te

125 syn 59.40 d ε - 125Te

127 100% 127 is stable with 74 neutrons

129 trace 1.57×10^7 y β− 0.194 129Xe

131 syn 8.02070 d β−, γ 0.971 131Xe

135 syn 6.57 h β− - 135X

That's no moon...http://en.wikipedia.org/wiki/File:Iodine-3D-vdW.png

The nature of I2's lineshttp://www.tau.ac.il/~phchlab/experiments_new/LIF/pics/image019.jpg

"Laser" I2 CellPD

PD

Adj. FP Interferometer

The idealized setup

The non-idealized setup

Inside the cell

Incandescent light source profile

Spectral data - 50C to 400C

High-res view of I2 features

nm

m: FP data n: laser current ramp p: I2 data

Fitting FP data

data pt #

Further refinement to FP data, but with fitted I2 data.

data pt #

Distance between FP peaks.

Δλ Δλ Δλ Δλ

Δλ = 0.031*4 = 0.124 nmn =~ 1l = 6.95*106 nmλ0 = 656 nm

Range from 656.786 nm --> 656.922. Δλ = 0.136 nm

Δλ = 0.124 nm

Appreciation:

Department of Physics and AstronomyDr. Michael CrescimannoDr. Howard MetteeDr. Alex Glenday, Harvard-SmithsonianIES systems, CanfieldBob and John, YSU machine shop

Issues