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Equation of Motion: Center of Mass01:14

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The equation of motion for a single particle can be expanded to encompass a system of particles consisting of n particles. For any arbitrarily chosen particle within this system, the net force acting upon it is the aggregate of both internal and external forces. Extending this principle to all particles within the system results in the equation of motion for the entire assembly.
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Preparing an Isotopically Pure 229Th Ion Beam for Studies of 229mTh
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Un reloj que vincula directamente el tiempo con la masa de una partícula.

Shau-Yu Lan1, Pei-Chen Kuan, Brian Estey

  • 1Department of Physics, University of California-Berkeley, CA 94720, USA.

Science (New York, N.Y.)
|January 12, 2013
PubMed
Resumen

Los científicos desarrollaron un nuevo reloj que vincula el tiempo y la masa utilizando la mecánica cuántica. Este avance permite mediciones de masa microscópicas precisas y redefine el segundo, impactando la física fundamental y las unidades SI.

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Área de la Ciencia:

  • La física cuántica es la física cuántica.
  • Metrología de la metrología.
  • Física atómica es la física atómica.

Sus antecedentes:

  • El cronometraje históricamente se basa en sistemas oscilantes, desde cuerpos celestes hasta transiciones atómicas.
  • La relatividad y la mecánica cuántica vinculan la masa de una partícula (m) con su frecuencia de Compton (ω(0) = mc2/ħ).
  • Un reloj basado en la frecuencia de Compton podría ofrecer mediciones de masa de alta precisión y una definición fundamental del tiempo.

Objetivo del estudio:

  • Para demostrar un reloj que hace referencia directa a la frecuencia de Compton (ω(0)).
  • Establecer un vínculo entre las constantes fundamentales del tiempo y la masa.
  • Para permitir mediciones de alta precisión de masas microscópicas.

Principales métodos:

  • Utilizando un peine de frecuencia óptica para auto-referenciar un interferómetro atómico Ramsey-Bordé.
  • Sincronizar un oscilador con una subarmónica de la frecuencia de Compton (ω(0)).
  • Medición directa de masas microscópicas con alta precisión.

Principales resultados:

  • Se demostró con éxito un reloj basado en la frecuencia de Compton de una partícula.
  • Se logró una precisión de medición de masa de 4 × 10−9.
  • Proporcionó un vínculo experimental directo entre el tiempo y la masa.

Conclusiones:

  • El reloj desarrollado permite definiciones fundamentales de tiempo y mediciones precisas de masa.
  • Esta tecnología apoya la propuesta de revisión de las unidades SI.
  • La integración con proyectos como Avogadro puede producir kilogramos calibrados.