Chapter 20, Problem 40P

5. The ground state of NO2 is A1. To what excited states may it be excited by electric dipole transitions, and what polarizations of light is it necessary to use to get the transition.

Q5. Explain the chemistry and workina principle of display devices specific to organic light-emitting diodes (OLEDS).

9. Absorption spectra for molecules are more complex than atomic spectra because: C (a) Molecular species have side reactions C (b) Atomic species do not absorb light C (c) The number of energy states of molecules is enormous when compared with the number of energy states for isolated atoms. 10 absorption / emission of light by a molecule and describe the processes in terms of energy levels. How this information can be used for obtaining analytical information on an analyte of interest? Explain the phenomenon of

β-Carotene (1) is a linear polyene in which 10 sing le and 11 double bonds alternate along a chain of 22 carbon atoms. If the length of each CC bond is taken to be about 140 pm , then the length L of the molecular box in β-carotene is L = 2.94 nm. Estimate the wavelength of the light absorbed bythis molecule when it undergoes a t rans it ion from its ground state to the next higher excited state.

The structure of the molecule cyclohexene is shown below: H H | H Ċ, H H. H H `H `H. Does the absorption of ultraviolet light by cyclohexene occur at shorter wavelengths than in benzene? Explain.

A carbon is covalently attached to =O, -CH2-CH3, and -CH3. It is best called a(n):     aldehyde     fatty acid     ketone     carbohydrate     alcohol     amino acid   The movement of low-density lipoprotein (LDL) particles into our body cells from the bloodstream occurs by:     passive transport       a channel protein       facilitated diffusion       active transport       exocytosis     Chlorophyll fluorescence occurs when electrons are unable to move forward in the reactions of photosynthesis because the reactions are slowing down. Which of the following would be likely to cause an increase in chlorophyll fluorescence, i.e. by slowing down photosynthesis? choose one or more, or none  1-making more thylakoid membranes in chloroplasts 2-giving chloroplasts access to more CO2 3-raising the pH of the thylakoid spaces

How the photon energy unit J is changed into pJ (pico-joule) by hand

What requirements must be met for a molecule to absorb IR radiation?

7. Consider the Jablonski diagrams below, where So, S₁, and S2 are all singlet electronic states, and T₁ is a triplet electronic state. (So is the electronic ground state.) The horizontal lines indicate the vibrational energy levels in each electronic state. The arrow drawn on the diagram represents the absorption of a UV photon with = 250 nm, promoting the molecule to a high vibrational level in the S₁ state. (The wavelength values here and below are meant as a guide, but this is not really a quantitative question.) Two different processes are described below the diagrams. Read each one, and then draw an appropriate set of arrows on the corresponding diagram to represent the process described. E Diagram #1 - Fluorescence process S₂ S₁ So SS5 T₁ Vo V4 V3 55555 V₂ V₁ V₁ Diagram #2 - Phosphorescence process E S₂ S₁ So 55555 Vo T₁ 7.1 Diagram #1: After the absorption shown in the diagram, the molecule fluoresces, emitting a photon with = 310 nm. ラララララ 7.2 Diagram #2: After the absorption…