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1st November 2015, 11:54 AM
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Join Date: Apr 2013
Re: IIT Guwahati Notes

As you want notes of Chemistry (CH-101) Subject of B.Tech First Semester Program of IIT Guwahati, so here I want to tell you that we have notes of following topics:

Blackbody Radiation
Postulates of Q.M
Tunneling of Electron
Vibrational Motion
Spectroscopic Transitions
VBT & MOT
Spectroscopy
Schroringer Wave Equation
Hydrogenic Atoms 2
Born-Oppenheimer
Hydrogenic Atoms

Notes of Tunneling of Electron
Tunnelling of electrons across a barrier: Consider an electron (particle-wave) located
at the left side of the barrier. The barrier is a potential energy barrier. At the left of the
barrier, the potential energy of the electron is zero (0). At the right of the barrier the
potential energy of the electron is also zero (0). However, the barrier has a height of V
(potential energy) which is much larger than the energy of the electron E; i.e. at the
barrier E<V. We need to find the wavefunction of the particle before the barrier, at the
barrier and after the barrier. Then we will calculate the transmission coefficient
(probability). This would be a function of the width of the barrier (L).

Quantum mechanics considers electrons to have both wave and particle like
properties. Tunneling is an effect of the wavelike nature of electron.

An important an interesting application of this nature of electron is the design and
operation of scanning tunnelling microscope (STM). In STM a tip is scanned across the
sample surface and the tunnelling current is related to the separation between the tip and
the sample surface. Thus from the current one can measure the distance and surface
profile of a conducting surface. Shown below is a typical geometry of the metallic tip
and conducting surface that is used in STM. One scans the surface across its length and
breadth and thus measures the surface profile from the tunnelling current.

Notes of Tunneling of Electron






Attached Files
File Type: pdf Notes of Blackbody Radiation-1.pdf (277.0 KB, 81 views)
File Type: pdf Notes of Vibrational Motion-2.pdf (132.5 KB, 70 views)


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