E11F.13(b) 3-Buten-2-one (6) has a strong absorption at 213 nm and a weaker absorption at 320 nm. Assign the ultraviolet absorption transitions, giving your reasons. 6 3-Buten-2-one
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- Infrared absorption by 1H127I gives rise to an R branch from v = 0. What is the wavenumber of the line originating from the rotational state with J = 2? Hint: Use data from Table 11C.1.The fundamental line (v′′ = 0 → v′ = 1) in the infrared absorption spectrum of 12C16O is at2143 cm–1 and the first overtone, (v′′ = 1 → v′ = 2), at 2117 cm–1. Determine Ve and XeVe for 12C16O.How many normal modes of vibration are there for (a)NO,. (b) N20. (c) cyclohexane. (d) hexane?
- The rotational constant of NH3 is 298 GHz. Calculate the separation of the pure rotational spectrum lines as a frequency (in GHz) and a wavenumber (in cm−1), and show that the value of B is consistent with an N–H bond length of 101.4 pm and a bond angle of 106.78°.What % of Hg atoms are in the excited state corresponding to absorption of a 253.7 nm photon at 2500 K? The degeneracy of the ground state 1 and the excited state is 2?By how many joules is the energy of a molecule increased when it absorbs (a) visible light with a wavelength of 500 nm or (b) infrared radiation with a wavenumber of 1 251 cm-1?
- Calculate the wavenumber of the first overtone transition w ith v = 2 ~ 0 in nitric oxide. NO. given that the valueof the vibrational wavenumber is v = 1904.03 em·' and theanharmonicity constant is x, = 0.0073.The moments of inertia for CH3CH3 is Ia=1.1 x 10-46 Kg.m2 and Ib=4.2 x 10-46 kg.m2 First Classify with motivation the molecule as prolate or oblate, Then Calculate the rotational constants A and B in cm-1.The vibrational transition from v=0 to v=1 in CO at wavelength= 4.556 × 10-5 cm, calculate the force constant in of the CO.
- (a) Calculate the moment of inertia of (i) 1H2, (ii) 2H2, (iii) 12C16O2, (iv) 13CO2 . (b) Calculate the corresponding rotational constants, expressing your answers as a frequency in hertz (Hz) and as a wavenumber in reciprocal centimetres (cm-1).Adenine has a molar extinction coefficient of 7020 mol dm–3 cm–1 at a wavelength of 265 nm and a characteristic NH2 bending vibration at 1650 cm–1. Show your working for each stage of this question. a) Calculate the transmission of 265 nm light through a 2.0×10–4 molar solution of adenine in a 0.5 cm wide cuvette. b) Calculate, ω, the fundamental frequency of the NH2 bend (in s–1).: A space probe was designed to seek carbon monoxide in Saturn’s atmosphere by looking for lines in its rotational spectrum. If the bond length of CO is 112.8 pm, at what wavenumbers (in cm-1) do the first three rotational transitions appear? Carbon is almost all carbon-12, so for this part, you can assume it’s all 12C). What resolution would be required to determine the isotropic ratio of 13C to 12C on Saturn by observing the first three 13CO rotational lines as well? (In other words how far apart, in cm-1, are the rotational transitions of 12CO and 13CO