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Measuring Electric Fields and Noncovalent Interactions Using the Vibrational Stark Effect
Organic Chemicals Proteins Vibration Models,Molecular Static Electricity
2016/5/25
Over the past decade, we have developed a spectroscopic approach to measure electric fields inside matter with high spatial (<1 Å) and field (<1 MV/cm) resolution. The approach hinges on exploiti...
Solvent-Induced Infrared Frequency Shifts in Aromatic Nitriles are Quantitatively Described by the Vibrational Stark Effect
Nitriles Spectroscopy,Fourier Transform Infrared Vibration Static Electricity Solvents
2016/5/25
The physical properties of solvents strongly affect the spectra of dissolved solutes, and this phenomenon can be exploited to gain insight into the solvent-solute interaction. The large solvatochromic...
Stark Realities
Rhodobacter Calibration Biocompatible Materials Magnetic Resonance Spectroscopy Materials Testing Biophysics Models,Theoretical Photochemistry Photosynthesis Chemistry, Physical
2016/5/25
Electric fields affect any process or transition that involves the movement of charge. Stark spectroscopy is a general term describing the study of spectral changes in the presence of electric fields,...
Stark Spectroscopy of Mixed-Valence Systems
Stark spectroscopy reaction centre mixed valence intervalence charge transfer Creutz–Taube ion
2016/5/25
Many mixed-valence systems involve two or more states with different electric dipole moments whose magnitudes depend upon the charge transfer distance and the degree of delocalization; these systems c...
Charge Delocalization in the Special-Pair Radical Cation of Mutant Reaction Centers of Rhodobacter Sphaeroides from Stark Spectra and Nonadiabatic Spectral Simulations
Rhodobacter sphaeroides Cations Spectrophotometry Spectroscopy, Fourier Transform Infrared Mutagenesis,Site-Directed Absorption Dimerization Oxidation-Reduction Mutation Electrochemistry
2016/5/24
Stark and absorption spectra for the hole-transfer band of the bacteriochlorophyll special pair in the wild-type and L131LH, M160LH, and L131LH/M160LH mutants of the bacterial reaction center of Rhodo...
Probing Excited-State Electron Transfer by Resonance Stark Spectroscopy:4.Mutations near BL in Photosynthetic Reaction Centers Perturb Multiple Factors that Affect BL/fBL+HL
Excited-State Electron Transfer Resonance Stark Spectroscopy Mutations near BL Photosynthetic Reaction Centers Perturb Multiple Factors BL/fBL+HL
2016/5/24
Stark spectra have been obtained in the region of absorption by the accessory bacteriochlorophylls (the B-band region around 800 nm) in Rhodobacter sphaeroides reaction centers. The Stark spectra in t...
Probing Excited-State Electron Transfer by Resonance Stark Spectroscopy:3.Theoretical Foundations and Practical Applications
contracted basis Lanczos algorithm methane vibrational spectroscopy
2016/5/24
Resonance Stark effects are nonclassical Stark effects associated with excited-state charge-transfer processes. The theory of resonance Stark effects developed in Part 2 of this series is generalized ...
A Theory of Intervalence Band Stark Effects
urea aggregation temperature effect orientational distribution
2016/5/24
The response of an intervalence band to an applied electric field, called an intervalence band Stark effect, is considered in detail. Because the application of an electric field to a symmetric mixed-...
Intervalence Band Stark Effect of the Special Pair Radical Cation in Bacterial Photosynthetic Reaction Centers
alloys low index single crystal surfaces low energy electron diffraction (LEED) scanning tunneling microscopy X-ray standing waves surface relaxation and reconstruction tin copper
2016/5/24
The Stark spectrum of the intervalence band of the special pair radical cation in bacterial photosynthetic reaction centers is presented. This spectrum, centered at 2600 cm-1, is modeled using a gener...
Vibrational Stark Effects of Nitriles II. Physical Origins of Stark Effects from Experiment and Perturbation Models
platinum titania catalyst flame synthesis one-step oxidation screening
2016/5/23
Vibrational Stark effects, which are the effects of electric fields on vibrational spectra, were measured previously for the C−N stretch mode of several small nitriles, yielding difference dipol...
Vibrational Stark Spectroscopy of NO Bound to Heme:Effects of Protein Electrostatic Fields on the NO Stretch Frequency
rare earth alloys X-ray diffraction crystal structure phase diagram
2016/5/23
The vibrational Stark effect measures the effect of an external electric field on the vibrational (IR) spectrum of a molecule. This technique gives quantitative information on the sensitivity of a vib...
Stark Effect Spectroscopy of the Heme Charge Transfer Bands of Deoxymyoglobin
materials science electronic structure oxygen compounds myoglobin charge transport stark effect absorption spectra spectroscopy heme protoporphyrins
2016/5/23
We report the Stark spectra of the Soret, Q, and charge-transfer bands of deoxymyoglobin. The data show that band III has charge-transfer character but that the magnitude of the charge displacement is...
Probing Excited State Electron Transfer by Resonance Stark Spectroscopy.II.Theory and Application
Excited State Electron Resonance Stark Spectroscopy Theory Application
2016/5/23
A theory of the resonance Stark effect data reported in part 1 (preceding paper in this issue) is developed. The model used involves a weak charge resonance interaction between the excited state of an...
Probing Excited State Electron Transfer by Resonance Stark Spectroscopy.I.Experimental Results for Photosynthetic Reaction Centers
adatoms bismuth photoelectron diffraction silicon
2016/5/23
Higher order Stark spectroscopy has recently been introduced and applied to characterize the electrooptic properties of chromophores in bacterial photosynthetic reaction centers.1 In the course of the...
Characterization of the Light Harvesting Antennas of Photosynthetic Purple Bacteria by Stark Spectroscopy:I.LH1 Antenna Complex and the B820 Subunit from Rhodospirillum rubrum
ABCD rule accessory nipples acral acrolentiginous actinic keratosis alopecia amelonotic angiokeratoma angioma arborizing blood vessels
2016/5/23
We present low-temperature Stark measurements on the core light-harvesting complex 1 (LH1) of purple bacteria and the B820 subunit derived from LH1, which is a protein bound Bchl a dimer. It was found...