Vibrational Modes Examines Molecular Motion to Detect Absorption or
Scattering 

Physics Academic Software Releases VIBRATIONAL MODES

December 18, 1992--VIBRATIONAL MODES simulates the vibrations of symmetric
and linear asymmetric triatomic molecules, demonstrating various
underlying concepts of molecular spectroscopy and chemical kinetics.

Developed by Daniel Lacks, Harvard University, VIBRATIONAL MODES enables
you to identify spectroscopically active modes and determine whether
infrared absorption or Raman scattering will occur by observing the
vibrational motion. You can choose the atomic masses, molecular geometry,
and force constants in either the central force field model or the valence
force field model for the simulations and view the resulting modes
singularly or in a linear combination. The program will calculate and
display the normal modes of vibration and the frequencies.

Vibrational modes play an important role in fields of study such as
molecular spectroscopy. The transfer of energy into the vibrational modes
of a molecule that causes either infrared absorption or Raman scattering,
depending on the symmetry of the atomic motion of the molecule. "By
viewing the motions of the atoms using VIBRATIONAL MODES," says Lacks,
"you can determine their symmetrics and thus determine which modes can be
detected with infrared absorption or Raman scattering."

VIBRATIONAL MODES is ideal for courses in molecular physics, physical
chemistry, and classical mechanics. It exceeds the inherent restrictions
of textbooks and lectures by allowing the user to actually see the ongoing
motion. The user's manual includes a description of the physics and the
computational methods used in the program, a tutorial to orient the user
to the program, operating instructions, and student exercises.

Reviewer response to VIBRATIONAL MODES has been positive. "Easy to
manipulate, clear, and concise," says Gary Bender, Tanana Middle School.
"The program provides an excellent conceptual framework and
visualization." David Blackman, UC Berkeley, says, "VIBRATIONAL MODES is
hypnotic."

VIBRATIONAL MODES is published and distributed by Physics Academic
Software, which is a project of the American Institute of Physics in
cooperation with the American Physical Society and the American
Association of Physics Teachers as part of a continuing series of
educational software from PAS.

VIBRATIONAL MODES operates on any Macintosh Plus computer or later with
finder version 6.0 or higher and system software version 6.0 or higher. A
printer is recommended.

VIBRATIONAL MODES may be purchased from Physics Academic Software for
$24.95 plus $3.50 shipping and handling for the first package ($7.50
foreign) and $.75 for each additional package. Lab Packs, which include
ten copies of the software and one User's Manual, are available for
$99.95.

For a limited time, you can purchase the entire PAS collection, with or
without Lab Packs, and save up to 33% off the regular price. Physics
Academic Software offers a no-risk guarantee by providing a full refund
for packages returned within 30 days.

PAS also offers a Standing Order Plan, which brings the latest in
innovative physics courseware to your door, along with exceptional
savings. When you join the Standing Order Plan, you will automatically
receive each new PAS program, with or without Lab Packs, and save up to
33% off the list price.

Orders and requests for a free catalog of all Physics Academic Software
titles should be directed to The Academic Software Library, Campus Box
8202, North Carolina State University, Raleigh, NC 27695-8202. By
telephone, call (800) 955-TASL or (919) 515-7447; FAX (919) 515-2682.

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