Cart
Article
Molecular Constants of Carbon Monoxide at v = 0, 1, 2, and 3: A Vibrational Spectroscopy Experiment in Physical Chemistry
Hi-Res PDFPurchase the full-text
- PDF/HTML,
figures/images,
references and tables,
(where available)
Abstract
The vibrational-rotational spectrum of a diatomic molecule is treated in most laboratory-experiment textbooks. The analysis usually refers to the fundamental absorption of the HCl molecule; the spectrum is analyzed to obtain the equilibrium rotational constant, the moment of inertia, and the internuclear distance. Parameters such as harmonic frequency, anharmonicity of the vibration, and centrifugal distortion are not obtained experimentally, but the students are usually encouraged to find the values in the literature.
The experiment described in this article deals with the vibrational-rotational transitions in carbon monoxide. The advantage of using CO is that the fundamental and first overtone are around 2143 and 4259 cm^-1, and the two regions can be covered with a standard FT IR. The experiment studies the vibrational-rotational transitions of the fundamental and the first and second overtones of CO. The experiment illustrates the decrease in absorption coefficient as a function of the excited vibrational quantum number and the magnitude of the changes in structural parameters, such as rotational constant, moment of inertia, and internuclear distance. The experiment also allows the students to obtain spectroscopic parameters, such as harmonic frequency, anharmonicity, rotation-vibration interaction constant, and centrifugal distortion.
Keywords (Audience):
Upper-Division UndergraduateKeywords (Domain):
Physical ChemistryKeywords (Pedagogy):
Hands-On Learning / ManipulativesKeywords (Subject):
CarbonCiting Articles
Citation data is made available by participants in CrossRef's Cited-by Linking service. For a more comprehensive list of citations to this article, users are encouraged to perform a search in SciFinder.
This article has been cited by 6 ACS Journal articles (5 most recent appear below).
Observation and Analysis of N2O Rotation–Vibration Spectra
Mark S. Bryant , Scott W. Reeve and William A. BurnsJournal of Chemical Education2008 85 (1), 121Observation and Analysis of N2O Rotation–Vibration Spectra
Mark S. Bryant , Scott W. Reeve and William A. BurnsJournal of Chemical Education2008 85 (1), 121The linear molecule N2O is presented as an alternative gas-phase species for the ubiquitous undergraduate physical chemistry rotation–vibration spectroscopy experiment. Utilizing a 0.5 cmâ
’1 resolution teaching grade FTIR spectrometer, 15 vibrational ...
The effect of anharmonicity on diatomic vibration: A spreadsheet simulation
William F. Coleman , Kieran F. LimJournal of Chemical Education2005 82 (8), 1263The effect of anharmonicity on diatomic vibration: A spreadsheet simulation
William F. Coleman , Kieran F. LimJournal of Chemical Education2005 82 (8), 1263This WebWare paper describes how a Microsoft Excel spreadsheet simulation, Anharmonicity.xls, can be used to smoothly and continuously switch a plotted function between a Morse function and its quadratic approximation.
Rotational Analysis of FTIR Spectra from Cigarette Smoke. An Application of Chem Spec II Software in the Undergraduate Laboratory
Alan R. Ford , William A. Burns and Scott W. ReeveJournal of Chemical Education2004 81 (6), 865Rotational Analysis of FTIR Spectra from Cigarette Smoke. An Application of Chem Spec II Software in the Undergraduate Laboratory
Alan R. Ford , William A. Burns and Scott W. ReeveJournal of Chemical Education2004 81 (6), 865A modification to the classic FTIR diatomic gas experiment performed in the undergraduate physical chemistry laboratory is described. A "real-world" sample source in the form of cigarette smoke has been incorporated and students are asked to identify the ...
Geometry of Benzene from the Infrared Spectrum
Elisabetta Cané , Andrea Miani and Agostino TrombettiJournal of Chemical Education1999 76 (9), 1288Geometry of Benzene from the Infrared Spectrum
Elisabetta Cané , Andrea Miani and Agostino TrombettiJournal of Chemical Education1999 76 (9), 1288The structure of benzene is fully determined once the interatomic distances rcc and rCH are obtained from experimental data. This infrared spectroscopy experiment allows the determination of rcc and rCH from the rotational analysis of an infrared active ...
Minimizing the Black Box Effect: Using Normal Mode Analysis to Integrate Computational Methods into the Physical Chemistry Course
Julio F. Caballero , Delphia F. HarrisJournal of Chemical Education1999 76 (9), 1298Minimizing the Black Box Effect: Using Normal Mode Analysis to Integrate Computational Methods into the Physical Chemistry Course
Julio F. Caballero , Delphia F. HarrisJournal of Chemical Education1999 76 (9), 1298The use of normal mode analysis in molecular vibrational studies as an introduction to computational methods in a physical chemistry course is presented. Students are involved in a literature search for molecules of current interest and in the use of a ...
Tools
-
Add to Favorites
-
Download Citation
-
Email a Colleague -
Permalink
Order Reprints
Rights & Permissions
Citation Alerts
History
- Received: August 03, 2009
ACS
Network
Facebook
Tweet This
CiteULike
Newsvine
Digg This
Delicious
