Download Basic Molecular Spectroscopy by P.A. Gorry (Auth.) PDF

By P.A. Gorry (Auth.)

Show description

Read Online or Download Basic Molecular Spectroscopy PDF

Similar physical chemistry books

Applied Mathematics for Physical Chemistry (2nd Edition)

The product was once in an ideal situation, the e-book itself is particularly useful while you're taking a actual Chemistry category to remind you of a few calculus purposes. i'm very chuffed with the product.

Molecular logic-based computation

Content material: a bit heritage; Chemistry and Computation; a bit good judgment and Computation; a bit Photochemistry and Luminescence; unmarried Input-Single Output platforms; topic Index

Physical chemistry for the chemical sciences

Following within the wake of Chang's different best-selling actual chemistry textbooks (Physical Chemistry for the Chemical and organic Sciences and actual Chemistry for the Biosciences), this new name introduces laser spectroscopist Jay Thoman (Williams collage) as co-author. This entire new textual content has been largely revised either in point and scope.

Extra info for Basic Molecular Spectroscopy

Example text

1 A diatomic molecule An important quantity for describing the energy of rotation is the moment of inertia, /, defined by /=Σ"ν? 3) m1rl=m2r2 and the fact that the bond length is given by r = rl+r2. 7) is true for any linear molecule, not just diatomics. 1. The potential energy may be set to zero since there is no change in bond length during the rotation. The detailed solution will not be given here but it can be found in any standard text on quantum mechanics. The energy levels obtained are given by the formula J = 0,l,2...

We have already stated that a molecule must first possess a permanent dipole moment. 32). 15) AJ= 1 corresponds to absorption and AJ= — 1 to emission. This rule is very powerful since it simplifies the spectrum considerably— indeed we need only consider adjacent levels when constructing the spectrum. 4 illustrates how application of this rule leads to the spectral lines arising from molecular rotational transitions. 16) Ej = 2B(J + l) The lines in the rotational spectrum are thus expected to occur at 23, 4B, 6B....

In order for a symmetric top molecule to exhibit a rotational spectrum it must possess a permanent dipole moment. Most symmetric top molecules have this dipole moment directed along the unique axis—if this is the case then we find the following selection rules AJ = 0, ±1 ΔΚ = 0 (Κ#0) AJ=±1 AK = 0 (K = 0) The fact that transitions between different K levels do not arise from photon absorption is not a surprise since the K quantum number signifies rotation about the unique axis—and hence the dipole.

Download PDF sample

Rated 4.84 of 5 – based on 33 votes

About admin