For the electronic transition 1Σ ← 1Σ of a diatomic molecule it has been calculated that rê' > re- From this it can be deduced that the vibration band 4 O corresponding to said transition a. only presents P and R branches, and the Q branch does not appear b. degrades towards red, with the edge or head of the band appearing in the R branch c. degrades towards violet, with the edge or head of the band appearing in the P branch d. degrades towards violet, with the edge or head of the band appearing in the R branch There are two valid answers.

For the electronic transition 1Σ ← 1Σ of a diatomic molecule it has been calculated that rê' > re- From this it can be deduced that the vibration band 4 O corresponding to said transition a. only presents P and R branches, and the Q branch does not appear b. degrades towards red, with the edge or head of the band appearing in the R branch c. degrades towards violet, with the edge or head of the band appearing in the P branch d. degrades towards violet, with the edge or head of the band appearing in the R branch There are two valid answers.

Principles of Instrumental Analysis

7th Edition

ISBN:9781305577213

Author:Douglas A. Skoog, F. James Holler, Stanley R. Crouch

Publisher:Douglas A. Skoog, F. James Holler, Stanley R. Crouch

Chapter19: Nuclear Magnetic Resonance Spectroscopy

Section: Chapter Questions

Problem 19.38QAP

See similar textbooks

Similar questions

Why is 133C-133C spin-spin splitting not observed in ordinary organic compounds?
The P-branch of the 2Π ← 2Σ+ transition of CdH shows a band head at J = 25. The rotational constant of the ground state is 5.437 cm−1. What is the rotational constant of the upper state? Has the bond length increased or decreased in the transition?
If a hypothetic vibrational motion of a molecule can be described by Tvib = 2A1 + E, within the point group Cav, how many bands/peaks would you expect to see in its IR spectrum? Explain your reasoning. C (4mm) E 2C, C, 20, 20, h=8 A, 1 1 1 1 x + y', 2 1 1 1 A, B, B, 1-1 -1 R. 1 -1 1 -1 x- y 1 -1 1-1 xy 2 0 -2 0 (x, y) (R, R) (2x, y2) 3.
The wavenumber of the fundamental vibrational transition of 35Cl2 is 564.9 cm−1. Calculate the force constant of the bond.
P11E.2 Suppose that three conformations are proposed for the nonlinear molecule H,O, (1, 2, and 3). The infrared absorption spectrum of gaseous H,O, has bands at 870, 1370, 2869, and 3417 cm. The Raman spectrum of the same sample has bands at 877, 1408, 1435, and 3407 cm. All bands correspond to fundamental vibrational wavenumbers and you may assume that: (a) the 870 and 877 cm bands arise from the same normal mode, and (b) the 3417 and 3407 cm bands arise from the same normal mode. (i) If H,O, were linear, how many normal modes of vibration would it have? (ii) Give the symmetry point group of each of the three proposed conformations of nonlinear H,O,. (iii) Determine which of the proposed conformations is inconsistent with the spectroscopic data. Explain your reasoning. 2
The equilibrium vibration frequency of the Iodine molecule is Us cm¹ and the an harmonicas constant -0.003 What is the intensity of hot band v=1→v=2 relative to that of the fundamental v=0-v-1, if the temperature is 300 °K ? .
1. [10] Consider an adsorption band in the combined rotational-vibrational spectrum of a linear molecule, where the fundamental vibrational frequency involved in the observed band is 2325 cm-¹ and the rotational constant of the molecule is B=2.4 cm³. Say hypothetically, the specific selection rules for the rotational states are AJ = ±2. At what wave numbers would the first three peaks that occur at both higher and lower wave numbers than fundamental vibrational frequency occur at? What transitions would each peak correspond to?
(c) Aqueous solutions of Co2+ salts are pale pink. They contain the complex ion [Co(H₂O)]2+. Addition of concentrated HCl results in a profound colour change to dark blue, due to formation of [CoC14]. The main absorption bands of [Co(H₂O)6]2+ and [CoC14] occur at 19400 cm¹ (~10 M¹ cm') and 14700 cm¹ (~ 1000 M¹ cm¹), respectively. (i) Explain the difference in the transition energies between the two complexes. (ii) Explain why the absorption band of [CoC14]² is much more intense than that of [Co(H2O)%]2+. (d) Calculate the ligand field stabilisation energy of the following complexes: (i) [Mn(H₂O)6]2+ (ii) [Fe(CN)6]³ (iii) [CoC14]²-
The protein haemerythrin (Her) is responsible for binding and carrying O2 in some invertebrates. Each protein molecule has two Fe2+ ions that are in very close proximity and work together to bind one molecule of O2, form ing an Fe2O2 group. (a) The Raman spectrum of oxygenated haemerythrinobtained with laser excitation at 500 nm has a band at 844 cm-1 which has been attributed to the O-O stretching mode of bound 16O2. Why is Raman spectroscopy and not infrared spectroscopy the method of choice for the study of the binding of O2 to haemerythrin? (b) Proof that the 844 cm-1band in the Raman spectrum of oxygenated haemerythrin arises from a bound O2 species may be obtained by conducting experiments on samples of haemerythrin that have been mixed with 18O2, instead of 16O2 . Predict the fundamental vibrational wavenumber of the 18O-18O stretching mode in a sample of haemerythrin that has been treated with 18O2. (c) The fundamental vibrational wavenumbers for the O-O stretching modes of O2,…
Use group theory to predict the number of v(CO) stretching vibrations you would expect to observe in the IR and Raman spectra of cis and trans isomers of Mo(CO)4(PPh3)2. Can these isomers be differentiated by vibrational spectroscopy? (ii) Can these isomers be differentiated by 31P{H} and 13C {¹H} spectroscopy? Fully explain your answer in both cases explaining what you would expect to see in each spectrum. (iii) Reaction of both isomers with more PPh3 affords mixtures of fac and mer isomers of [Mo(CO)3 (PPh3)3]. Give the point groups for each. Can they be distinguished by IR spectroscopy? Please give me all answers
The wavenumber of the fundamental vibrational transition of Cl 2 is 565 em·'. Calculate the force constant of thebond.
1. Carbon monoxide has an equilibrium bond length of 1.128 Å and a spring constant of k = 1.118 PHz² amu. Using the atomic masses mc = 12.011 amu and mo = 15.999 amu, determine all the wavenumbers visible in the rovibrational Raman spectrum between 2100 cm¹ and 2175 cm-1.