femtosecond

Thân thiện

A scientist uses a femtosecond laser to study chemical reactions.

Definition

Noun: A unit of time equal to one quadrillionth (10⁻¹⁵) of a second. It is one thousandth of a picosecond.

Usage

This is a scientific and technical term used in physics, chemistry, and engineering to measure extremely short durations of time, such as the time it takes for chemical bonds to form or break, or for light to travel a very short distance.

Examples

• Noun:
  • The laser pulse lasted only a few femtoseconds.
  • Scientists can now observe molecular reactions on a femtosecond timescale.
  • A femtosecond is to one second what one second is to about 31.7 million years.

Advanced Usage

• Attosecond and Femtosecond: An attosecond is one thousand times shorter than a femtosecond (10⁻¹⁸ seconds). pulses are used to study electron dynamics, while pulses can probe even faster processes.
• Femtosecond Laser: A type of laser that emits ultra-short optical pulses with durations in the femtosecond range. These are used in precision machining, eye surgery, and fundamental research.
  • Femtosecond laser surgery has revolutionized corneal procedures.

Variants and Related Words

• Femtosecond (adj.): Used attributively to describe phenomena or instruments related to this timescale.
  • Femtosecond chemistry. Femtosecond spectroscopy.
• Femtochemistry (n.): The area of physical chemistry that studies chemical reactions on extremely short timescales (approximately 10⁻¹⁵ seconds).
• Picosecond (n.): A unit of time equal to one trillionth (10⁻¹²) of a second. One picosecond equals 1000 femtoseconds.

Synonyms

• 10⁻¹⁵ second: The scientific notation is a direct synonym.
• (One) quadrillionth of a second: The descriptive phrase.

Related Phrases and Contexts

• On a femtosecond timescale: Happening within a duration measured in femtoseconds.
  • These quantum events occur on a femtosecond timescale.
• Femtosecond precision: The ability to measure or control events with an accuracy of femtoseconds.
  • The experiment required femtosecond precision in timing the laser pulses.

Học thuật

Noun

1. one quadrillionth (10^-15) of a second; one thousandth of a picosecond