The Absorption Spectrum of I odine I I Symmetric Stretch Susumu - - PowerPoint PPT Presentation

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The Absorption Spectrum of I odine I I Symmetric Stretch Susumu - - PowerPoint PPT Presentation

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The Absorption Spectrum of I odine I I Symmetric Stretch Susumu Takahashi CHEM 332L-January 10, 2016 15-20 min. powerpoint/ White-board presentation Goal of the experiment Determination of the molecular electronic and vibrational

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SLIDE 1

I I

Symmetric Stretch

The Absorption Spectrum

  • f I odine

Susumu Takahashi

CHEM 332L-January 10, 2016

15-20 min. powerpoint/ White-board presentation

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SLIDE 2

Goal of the experiment

 Determination of the molecular electronic

and vibrational properties of I 2.

 Dissociation energy of iodine in its ground

and excited electronically states

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SLIDE 3

Background

  • Energy diagram of I odine

Using vibrational spectroscopy, The followings are determined,

  • 1. Energy levels ( and x)
  • 2. Dissociation energies (D)

G(v) = ωi(v+1/2) - ωixi(v+1/2)2 The vibrational levels are well described by (i = g or e)

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SLIDE 4

Experimental setup

  • spectrometer

Iodine sample Light source slit

Grating angle readout (x)

PMT detector

  • Voltage (y)

mirror

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SLIDE 5

Experimental details

  • Calibration of Spectrometer

0.00E+ 00 2.00E-02 4.00E-02 6.00E-02 8.00E-02 1.00E-01 1.20E-01 1.40E-01 14000 14500 15000 15500 16000

Detected Signal Monochromator Dial Reading

Mercury Penlight Calibration Data

Peak Average (Dial Number) Spectrum line (nm) 14000 254 14816.5 297 14858.5 313 15778 436 15803.5 546

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SLIDE 6

Experimental details

  • Calibration of Spectrometer

y = 0.1442x - 1801.2 R² = 0.8307 100 200 300 400 500 600 13500 14000 14500 15000 15500 16000

Wavelength (Nanometers) Monochromator Dial Reading

Mercury Penlight Calibration

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SLIDE 7

6 2 0 6 1 0 6 0 0 5 9 0 5 8 0 5 7 0 5 6 0 5 5 0 5 4 0 5 3 0 5 2 0 5 1 0 5 0 0 1 .5 2 .0 2 .5 3 .0 3 .5 4 .0 4 .5 5 .0 5 .5 6 .0 6 .5 7 .0

Absorbance (arbitrary units) W a v e le n th (n m )

A b s o rb a n c e S p e c tru m o f I 2

Experimental data (or expected result)

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SLIDE 8

575 570 565 560 555 550 545 540 535 530 525 520 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5 6.0 6.5 7.0

17 18 15

Absorbance (arbitrary units) W avelenth (nm )

N um bering of B ands in the S elected S pectrum (575-520 nm ) of I2

v"= 0 v"= 1 v"= 2

38 37 36 35 34 17 16 32 30 29 28 27 26 25 24 23 22 21 20 19 18 24 23 22 21 20 19 23 22 21 33 31 30 29 28 27 25 26 20

Experimental data (or expected result)

Explain data points carefully

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SLIDE 9

16 18 20 22 24 26 28 30 32 34 36 38 40 50 55 60 65 70 75 80 85 90 95 100 105 110 115

Integrated Area = 4456.501 cm

  • 1

Birge-Sponer Plot for v"=0

G (cm

  • 1)

v'+1

Y= 140.176 (2.981) - 2.204(.1055)X

Data analysis

  • plot of the result
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SLIDE 10

Summary

 Summarize the goal of the experiment  State expected finding  Discuss prelimnary result and error

analysis if there is