Jove
Visualize
Contact Us
JoVE
x logofacebook logolinkedin logoyoutube logo
ABOUT JoVE
OverviewLeadershipBlogJoVE Help Center
AUTHORS
Publishing ProcessEditorial BoardScope & PoliciesPeer ReviewFAQSubmit
LIBRARIANS
TestimonialsSubscriptionsAccessResourcesLibrary Advisory BoardFAQ
RESEARCH
JoVE JournalMethods CollectionsJoVE Encyclopedia of ExperimentsArchive
EDUCATION
JoVE CoreJoVE BusinessJoVE Science EducationJoVE Lab ManualFaculty Resource CenterFaculty Site
Terms & Conditions of Use
Privacy Policy
Policies

Related Concept Videos

¹H NMR: Interpreting Distorted and Overlapping Signals01:02

¹H NMR: Interpreting Distorted and Overlapping Signals

Spin systems where the difference in chemical shifts of the coupled nuclei is greater than ten times J are called first-order spin systems. These nuclei are weakly coupled, and their chemical shifts and coupling constant can generally be estimated from the well-separated signals in the spectrum.
As Δν decreases and the signals move closer, the doublets appear increasingly distorted. The intensities of the inner lines increase at the cost of those of the outer lines as the signals are slanted or...
Insensitive Nuclei Enhanced by Polarization Transfer (INEPT)01:15

Insensitive Nuclei Enhanced by Polarization Transfer (INEPT)

Insensitive Nuclei Enhanced by Polarization Transfer (INEPT) is an advanced Nuclear Magnetic Resonance (NMR) technique specifically designed to detect and enhance the signals of low-abundance nuclei, such as carbon-13 and nitrogen-15, in small molecules. The fundamental principle behind INEPT is the transfer of polarization from a more abundant and highly polarizable nucleus, typically hydrogen-1, to the low-abundance nucleus of interest. This process effectively boosts the NMR signal of the...
Interpreting ¹H NMR Signal Splitting: The (n + 1) Rule01:10

Interpreting ¹H NMR Signal Splitting: The (n + 1) Rule

In the AX proton spin system, proton A can sense the two spin states of a coupled proton X, resulting in a doublet NMR signal with two peaks of equal (1:1) intensity. When proton A is coupled to two equivalent protons (AX2 spin system), the spin states of each X can be aligned with or against the external field, creating three possible scenarios. This results in a 1:2:1  triplet signal, where the central peak corresponds to the chemical shift of A and is twice as large or intense as the others.
Nuclear Overhauser Enhancement (NOE)01:06

Nuclear Overhauser Enhancement (NOE)

Irradiation of a spin-active nucleus causes an increase or decrease in the signal intensity of neighboring nuclei that are not necessarily chemically bonded or involved in J-coupling. This phenomenon, called the nuclear Overhauser enhancement (NOE), results from through-space interactions between the nuclear spins. The NOE effect decreases with increasing internuclear distance and is generally not observed beyond 4 angstroms. In NOE, dipole-dipole interactions between neighboring spin-active...
IR Spectrum Peak Splitting: Symmetric vs Asymmetric Vibrations01:08

IR Spectrum Peak Splitting: Symmetric vs Asymmetric Vibrations

Identical bonds within a polyatomic group can stretch symmetrically (in-phase) or asymmetrically (out-of-phase). Similar to hydrogen bonding, these vibrations also influence the shape of the IR peak. Generally, asymmetric stretching frequencies are higher than symmetric stretching frequencies. For example, primary amines exhibit two distinct IR peaks between 3300–3500 cm−1 corresponding to the symmetric and asymmetric N-H stretching, while secondary amines exhibit a single stretching vibration...
¹H NMR: Complex Splitting01:13

¹H NMR: Complex Splitting

A proton M that is coupled to a proton X results in doublet signals for M. However, NMR-active nuclei can be simultaneously coupled to more than one nonequivalent nucleus. When M is coupled to a second proton A, such as in styrene oxide, each peak in the doublet is split into another doublet.
Splitting diagrams or splitting tree diagrams are routinely used to depict such complex couplings. While drawing splitting diagrams, the splitting with the larger coupling constant is usually applied first.

You might also read

Related Articles

Articles linked to this work by shared authors, journal, and citation graph.

Sort by
Same author

Coherent Spin Dynamics of Electrons in CdSe Colloidal Nanoplatelets.

Nanomaterials (Basel, Switzerland)·2023
Same author

Optical Alignment and Optical Orientation of Excitons in CdSe/CdS Colloidal Nanoplatelets.

Nanomaterials (Basel, Switzerland)·2023
Same author

A Comparative Study of the Band-Edge Exciton Fine Structure in Zinc Blende and Wurtzite CdSe Nanocrystals.

Nanomaterials (Basel, Switzerland)·2022
Same author

Electron Spin Coherence in CdSe Nanocrystals in a Glass Matrix.

ACS nano·2022
Same author

General Expression for the Size-Dependent Optical Properties of Quantum Dots.

Nano letters·2022
Same author

Mid-infrared irradiation keeps nanocrystals bright.

Nature nanotechnology·2021

Related Experiment Video

Updated: Jun 17, 2026

Probe Type II Band Alignment in One-Dimensional Van Der Waals Heterostructures Using First-Principles Calculations
13:56

Probe Type II Band Alignment in One-Dimensional Van Der Waals Heterostructures Using First-Principles Calculations

Published on: October 12, 2019

Band offsets in InP/ZnSe nanocrystals evaluated using two-photon transitions analysis.

Kirill I Russkikh1, Aleksandr A Golovatenko1, Anna V Rodina1

  • 1Ioffe Institute, Russian Academy of Sciences, 194021 St Petersburg, Russia. sasha.pti@mail.ioffe.ru.

Nanoscale
|June 16, 2026
PubMed
Summary

This study investigates InP/ZnSe nanocrystals, revealing that electric dipoles at the interface influence their optical properties. This finding is crucial for understanding and designing advanced nanomaterials.

More Related Videos

Measurements of Long-range Electronic Correlations During Femtosecond Diffraction Experiments Performed on Nanocrystals of Buckminsterfullerene
08:44

Measurements of Long-range Electronic Correlations During Femtosecond Diffraction Experiments Performed on Nanocrystals of Buckminsterfullerene

Published on: August 22, 2017

Related Experiment Videos

Last Updated: Jun 17, 2026

Probe Type II Band Alignment in One-Dimensional Van Der Waals Heterostructures Using First-Principles Calculations
13:56

Probe Type II Band Alignment in One-Dimensional Van Der Waals Heterostructures Using First-Principles Calculations

Published on: October 12, 2019

Measurements of Long-range Electronic Correlations During Femtosecond Diffraction Experiments Performed on Nanocrystals of Buckminsterfullerene
08:44

Measurements of Long-range Electronic Correlations During Femtosecond Diffraction Experiments Performed on Nanocrystals of Buckminsterfullerene

Published on: August 22, 2017

Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Quantum Chemistry

Background:

  • Core-shell nanocrystals like InP/ZnSe offer tunable electronic and optical properties.
  • Understanding their energy structure and optical transitions is key for applications in optoelectronics.

Purpose of the Study:

  • To theoretically investigate the energy structure and optical transitions in spherical InP/ZnSe core-shell nanocrystals.
  • To analyze the impact of band offsets and Coulomb interaction on absorption spectra and exciton states.

Main Methods:

  • Semi-analytical theoretical study using the eight-band Kane model and six-band Luttinger Hamiltonian.
  • Perturbative treatment of Coulomb interaction.
  • Calculation of one- and two-photon absorption spectra and linear-circular dichroism.

Main Results:

  • Calculated electron and hole energy spectra and optical transitions.
  • Identified exciton states and predicted spectral dependence of linear-circular dichroism.
  • Determined a valence band offset range of 0.85-1 eV, exceeding theoretical expectations.

Conclusions:

  • The determined band offset suggests the presence of electric dipoles at the InP/ZnSe heterointerface due to preferential Zn-P bonds.
  • Inhomogeneous broadening can obscure transitions to the ground two-photon-active exciton state.
  • The findings provide insights into the electronic and optical behavior of InP/ZnSe nanocrystals.