Convert Attojoules to Femtojoules
Convert Attojoules (aJ) to Femtojoules (fJ) instantly and accurately.
Conversion Formula
fJ = aJ × 0.001
About Attojoules
An attojoule (aJ) is 10⁻¹⁸ J - the scale of individual X-ray photons and superconducting qubit circuits. A 1 keV X-ray photon carries 160 aJ; a visible green photon (~550 nm) carries ~0.36 aJ. Josephson junction energies in superconducting qubits are set in tens to hundreds of aJ to achieve quantum coherence at millikelvin temperatures. XRISM's cryogenic TES X-ray spectrometer resolves individual photon energies at the hundreds-of-aJ level with ~7 eV FWHM resolution. 1 aJ = 10⁻¹⁸ J = 6.242 eV.
About Femtojoules
A femtojoule (fJ) is 10⁻¹⁵ J - the scale of gamma-ray photons, molecular motor work, and state-of-the-art digital logic. The electron rest-mass energy is 81.87 fJ; a 100 keV X-ray photon carries 16.02 fJ. A single myosin II motor protein power stroke dissipates ~5-40 fJ. ATP hydrolysis under cellular conditions yields ~80-100 fJ of free energy. Advanced 3 nm CMOS gates switch at ~0.1-1 fJ per operation. Ultrafast fiber laser oscillators produce pulses of 0.1-10 fJ before amplification. 1 fJ = 10⁻¹⁵ J = 6.242 keV.
Quick Reference Table
| Attojoules (aJ) | Femtojoules (fJ) |
|---|---|
| 1 aJ | 0.001 fJ |
| 2 aJ | 0.002 fJ |
| 5 aJ | 0.005 fJ |
| 10 aJ | 0.01 fJ |
| 25 aJ | 0.025 fJ |
| 50 aJ | 0.05 fJ |
| 100 aJ | 0.1 fJ |