Electron Volts Converter

How to Use the Electron Volts Converter

1. Enter eV value: Type the energy in electron volts (eV) in the input field. Real-time conversion occurs as you type.
2. View all conversions: See instant conversions to joules, keV, MeV, GeV, TeV, and corresponding photon wavelength in nanometers.
3. Copy any value: Click on any result card to copy that specific conversion to your clipboard.
4. Reset values: Use the Clear button to reset all fields and start a new conversion.

What is an Electron Volt (eV)?

The electron volt (eV) is a unit of energy commonly used in atomic, nuclear, and particle physics. It's defined as the amount of kinetic energy gained by a single electron when it accelerates through an electric potential difference of one volt in vacuum. One electron volt equals approximately 1.602176634 × 10⁻¹⁹ joules.

While incredibly small by everyday standards, the electron volt is perfectly scaled for measuring energies at the atomic and subatomic level. It's the standard energy unit in particle physics, spectroscopy, and semiconductor physics, making energy calculations more intuitive than using joules for microscopic phenomena.

Conversion Formulas

Electron volt conversions are based on fundamental physical constants:

1 eV = 1.602176634 × 10⁻¹⁹ joules

1 keV = 1,000 eV = 1.602 × 10⁻¹⁶ J

1 MeV = 1,000,000 eV = 1.602 × 10⁻¹³ J

1 GeV = 1,000,000,000 eV = 1.602 × 10⁻¹⁰ J

1 TeV = 1,000,000,000,000 eV = 1.602 × 10⁻⁷ J

Wavelength (nm) = 1239.84 / Energy (eV)

Atomic and Molecular Energy Scales

Chemical Bonds: Typical covalent bond energies range from 1-10 eV. A C-C single bond has about 3.6 eV, while C=C double bond has about 6.3 eV.

Ionization Energy: The energy required to remove an electron from an atom. Hydrogen's ionization energy is 13.6 eV, while heavier elements range from 4-25 eV.

Visible Light Photons: Photons in visible light range from 1.65 eV (red, 750 nm) to 3.1 eV (violet, 400 nm).

Thermal Energy: At room temperature (300 K), thermal energy kT is approximately 0.026 eV, important for semiconductor and statistical mechanics calculations.

X-Ray and High Energy Physics

X-Ray Photons: Medical X-rays have energies from 10-150 keV. Dental X-rays use about 70 keV, while chest X-rays use 20-50 keV photons.

Gamma Rays: Radioactive decay produces gamma rays with energies typically from 100 keV to several MeV. Cobalt-60 emits 1.17 and 1.33 MeV gamma rays.

Electron Microscopy: Transmission electron microscopes accelerate electrons to 80-300 keV for imaging at atomic resolution.

Medical Imaging: PET scans detect 511 keV gamma rays from positron-electron annihilation events.

Particle Physics Energy Scales

Electron Rest Mass: 0.511 MeV/c² (megaelectron volts divided by the speed of light squared), equivalent to the electron's mass-energy.

Proton Rest Mass: 938.3 MeV/c², about 1,836 times heavier than an electron.

Particle Accelerators: The Large Hadron Collider (LHC) at CERN collides protons at energies up to 13 TeV (13,000 GeV), enabling discovery of new particles.

Higgs Boson: Discovered in 2012 with a mass of approximately 125 GeV/c², confirming predictions of the Standard Model of particle physics.

Cosmic Rays: The highest energy cosmic rays exceed 10²⁰ eV (100 EeV), millions of times more energetic than LHC collisions.

Semiconductor and Materials Science

Band Gap Energy: Semiconductors have characteristic band gaps. Silicon has 1.12 eV, gallium arsenide 1.43 eV, and diamond 5.47 eV.

LED Emission: Light-emitting diodes produce photons with energy matching their band gap. Red LEDs emit ~1.8 eV photons, blue LEDs ~2.7 eV.

Solar Cells: Silicon solar cells efficiently absorb photons above 1.12 eV. Multijunction cells use materials with different band gaps to capture broader spectrum.

Work Function: The minimum energy to remove an electron from a metal surface. Gold has 5.1 eV, tungsten 4.5 eV work function.

Spectroscopy Applications

UV Spectroscopy: Ultraviolet photons range from 3.1 eV (400 nm) to 124 eV (10 nm), used for analyzing electronic transitions in molecules.

Photoelectron Spectroscopy: Measures electron binding energies in atoms and molecules, typically in the range of 10-1000 eV.

Auger Electron Spectroscopy: Analyzes surface composition using Auger electrons with energies from 50-2000 eV.

X-Ray Photoelectron Spectroscopy (XPS): Uses 200-2000 eV X-rays to study chemical composition and electronic states of materials.

Why Electron Volts Matter

The electron volt provides appropriately scaled units for atomic and nuclear phenomena, simplifies calculations in quantum mechanics and particle physics, enables direct comparison of photon energies with atomic transition energies, and facilitates understanding of mass-energy equivalence through E=mc². This converter helps physicists, chemists, engineers, and students work seamlessly between eV scales and SI units.