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

Types of Collisions - II01:19

Types of Collisions - II

9.5K
When two or more objects collide with each other, they can stick together to form one single composite object (after collision). The total mass of the object after the collision is the sum of the masses of the original objects, and it moves with a velocity dictated by the conservation of momentum. Although the system's total momentum remains constant, the kinetic energy decreases, and thus such a collision is an inelastic collision. Most of the collisions between objects in daily life are...
9.5K
Elastic Collisions: Introduction01:00

Elastic Collisions: Introduction

14.8K
An elastic collision is one that conserves both internal kinetic energy and momentum. Internal kinetic energy is the sum of the kinetic energies of the objects in a system. Truly elastic collisions can only be achieved with subatomic particles, such as electrons striking nuclei. Macroscopic collisions can be very nearly, but not quite, elastic, as some kinetic energy is always converted into other forms of energy such as heat transfer due to friction and sound. An example of a nearly...
14.8K
Elastic Collisions: Case Study01:15

Elastic Collisions: Case Study

20.0K
Elastic collision of a system demands conservation of both momentum and kinetic energy. To solve problems involving one-dimensional elastic collisions between two objects, the equations for conservation of momentum and conservation of internal kinetic energy can be used. For the two objects, the sum of momentum before the collision equals the total momentum after the collision. An elastic collision conserves internal kinetic energy, and so the sum of kinetic energies before the collision equals...
20.0K
Conservation of Angular Momentum: Application01:18

Conservation of Angular Momentum: Application

12.0K
A system's total angular momentum remains constant if the net external torque acting on the system is zero. Examples of such systems include a freely spinning bicycle tire that slows over time due to torque arising from friction, or the slowing of Earth's rotation over millions of years due to frictional forces exerted on tidal deformations. However in the absence of a net external torque, the angular momentum remains conserved. The conservation of angular momentum principle requires a...
12.0K
Conservation of Angular Momentum01:09

Conservation of Angular Momentum

15.7K
A system's total angular momentum remains constant if the net external torque acting on the system is zero. Considering a system that consists of n tiny particles, the angular momentum of any tiny particle may change, but the system's total angular momentum would remain constant. The principle of conservation of angular momentum only considers the net external torque acting on the system. While there are internal forces exerted by different particles within the system that also produce...
15.7K
Basic Postulates of Kinetic Molecular Theory: Particle Size, Energy, and Collision02:43

Basic Postulates of Kinetic Molecular Theory: Particle Size, Energy, and Collision

37.2K
The ideal-gas equation, which is empirical, describes the behavior of gases by establishing relationships between their macroscopic properties. For example, Charles’ law states that volume and temperature are directly related. Gases, therefore, expand when heated at constant pressure. Although gas laws explain how the macroscopic properties change relative to one another, it does not explain the rationale behind it.
37.2K

You might also read

Related Articles

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

Sort by
Same author

Air pollution as a mediator of heat-related all-cause mortality among older U.S. adults.

Environment international·2026
Same author

High external power narrow bandwidth erbium doped waveguide laser on thin film lithium niobate.

Nanophotonics (Berlin, Germany)·2025
Same author

Hybrid Si/III-V quantum cascade lasers integrated on a phase-matched mid-infrared silicon photonic platform.

Optics express·2025
Same author

Differential Effects of Wildfire Smoke Fine Particulate Matter Exposure on Respiratory Disease Emergency Department Visits in the Western United States.

American journal of respiratory and critical care medicine·2025
Same author

Case-crossover assessment of the modifying effects of home medication use on acute kidney-related morbidity due to elevated ambient heat exposure in Atlanta, GA, from 2013 to 2019.

BMJ public health·2025
Same author

The role of the components of PM<sub>2.5</sub> in the incidence of Alzheimer's disease and related disorders.

Environment international·2025

Related Experiment Video

Updated: Jan 1, 2026

Laboratory Drop Towers for the Experimental Simulation of Dust-aggregate Collisions in the Early Solar System
09:44

Laboratory Drop Towers for the Experimental Simulation of Dust-aggregate Collisions in the Early Solar System

Published on: June 5, 2014

13.3K

Observing collisions beyond the secular approximation limit.

Junyang Ma1,2, Haisu Zhang1, Bruno Lavorel1

  • 1Laboratoire Interdisciplinaire CARNOT de Bourgogne, UMR 6303 CNRS-Université de Bourgogne Franche-Comté, BP 47870, 21078, Dijon, France.

Nature Communications
|December 20, 2019
PubMed
Summary
This summary is machine-generated.

This study explores the limits of the secular approximation in molecular collisions. Researchers observed that environmental interactions significantly impact quantum coherence, challenging standard models.

More Related Videos

Setting Limits on Supersymmetry Using Simplified Models
07:46

Setting Limits on Supersymmetry Using Simplified Models

Published on: November 15, 2013

8.9K
An Analog Macroscopic Technique for Studying Molecular Hydrodynamic Processes in Dense Gases and Liquids
11:03

An Analog Macroscopic Technique for Studying Molecular Hydrodynamic Processes in Dense Gases and Liquids

Published on: December 4, 2017

8.9K

Related Experiment Videos

Last Updated: Jan 1, 2026

Laboratory Drop Towers for the Experimental Simulation of Dust-aggregate Collisions in the Early Solar System
09:44

Laboratory Drop Towers for the Experimental Simulation of Dust-aggregate Collisions in the Early Solar System

Published on: June 5, 2014

13.3K
Setting Limits on Supersymmetry Using Simplified Models
07:46

Setting Limits on Supersymmetry Using Simplified Models

Published on: November 15, 2013

8.9K
An Analog Macroscopic Technique for Studying Molecular Hydrodynamic Processes in Dense Gases and Liquids
11:03

An Analog Macroscopic Technique for Studying Molecular Hydrodynamic Processes in Dense Gases and Liquids

Published on: December 4, 2017

8.9K

Area of Science:

  • Quantum mechanics
  • Molecular dynamics
  • Spectroscopy

Background:

  • Quantum coherence is vital in nature and technology.
  • Environmental interactions cause dissipation, often simplified by the secular approximation.
  • The validity of this approximation in molecular relaxation needs investigation.

Purpose of the Study:

  • To test the limits of the secular approximation in molecular rotational relaxation.
  • To investigate the influence of thermal collisions on quantum coherence.
  • To model decoherence processes in molecular systems.

Main Methods:

  • Utilized the laser-kicked molecular rotor as a model system.
  • Created rotational coherences in N2O gas using intense laser pulses.
  • Probed decoherence by analyzing rotational alignment echo amplitude versus gas density.

Main Results:

  • Observed significant variations in dissipative influence with echo appearance time.
  • Demonstrated a time-dependent decoherence process.
  • Found that nonsecular quantum master equations accurately model molecular collisions.

Conclusions:

  • The secular approximation is not universally valid for molecular collisional relaxation.
  • Environmental coupling leads to complex, time-dependent decoherence.
  • Advanced quantum master equations are necessary for accurate modeling.