1 / 8

441 Chem

441 Chem. CH-1. Introduction to Spectroscopy. Introduction to Spectroscopy. Set of methods where interaction of electromagnetic radiation with chemical molecules. Electromagnetic Radiation. = Frequency of Radiation (Hertz or S -1 ) l = Wave Length (cm ) V = Wave Number (cm -1 )

mfletcher
Télécharger la présentation

441 Chem

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. 441 Chem CH-1 • Introduction to Spectroscopy

  2. Introduction to Spectroscopy Set of methods where interaction of electromagnetic radiation with chemical molecules. Electromagnetic Radiation • = Frequency of Radiation (Hertz or S-1) • l= Wave Length (cm) • V = Wave Number (cm-1) • C = Velocity of light (constant) = 3 x 1010 cm/sec

  3. The energy of quantum: h (Planck's constant) = 6.62 x 10-27 (Erg/sec)

  4. The Electromagnetic Spectrum Frequency (n) high low high low Energy MICRO- WAVE X-RAY ULTRAVIOLET INFRARED RADIO FREQUENCY Nuclear magnetic resonance Vibrational infrared Visible Ultraviolet 2.5 mm 15 mm 1 m 5 m 200 nm 400 nm 800 nm BLUE RED Wavelength (l) short long

  5. Internal Energy of Molecules: Etotal= Eelec+Evib+Erot Eelec: Electronic transitions Evib: Vibrational transitions Erot: Rotational transitions The Excitation process

  6. 1.0 Absorbance 0.0 200 800 400 Wavelength,  • Type of Spectroscopy: • 1- Emission Spectroscopy • 2- Absorption Spectroscopy Absorption Spectroscopy

  7. Types of Energy Transitions in Each Region of the Electromagnetic Spectrum REGION ENERGY TRANSITIONS X-ray Bond-breaking Electronic UV/Visible Infrared Vibrational Microwave Rotational • Nuclear and Electronic Spin RadioFrequency

  8. Summary of Spectroscopic Methods in Organic Chemistry

More Related