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Espectros de hielo por aprendizaje automático: de 1 a 256 características

Shokirbek Shermukhamedov1, Jolla Kullgren1, Daniel Sethio1

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Los modelos de aprendizaje automático predicen con precisión las propiedades espectroscópicas del hielo. El modelo MACE (Message Passing Atomic Cluster Expansion) logró una alta precisión para las frecuencias vibratorias de OH y los desplazamientos químicos de protones.

Palabras clave:
aprendizaje automáticohielopropiedades espectroscópicasfrecuencias vibratoriasdesplazamientos químicosMACE

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Área de la Ciencia:

  • Química computacional; Ciencia de materiales; Espectroscopia

Sus antecedentes:

  • La predicción de las propiedades espectroscópicas de materiales como el hielo es crucial para comprender su comportamiento.; El aprendizaje automático y las huellas estructurales ofrecen vías prometedoras para acelerar estas predicciones.

Objetivo del estudio:

  • Evaluar la eficacia de los modelos de aprendizaje automático y las huellas estructurales en la predicción de las frecuencias vibratorias de OH y los desplazamientos químicos de 1H del hielo.; Comparar el rendimiento de diferentes modelos de aprendizaje automático y descriptores.

Principales métodos:

  • Se utilizó un gran conjunto de datos teóricos de 55 polimorfos de hielo con 1010 puntos de datos DFT.; Se emplearon modelos de aprendizaje automático que incluyen MACE (Message Passing Atomic Cluster Expansion), ACSF y SOAP.; Se evaluó el rendimiento utilizando la desviación cuadrática media (RMSD) para los desplazamientos químicos y las frecuencias vibratorias.

Principales resultados:

  • El modelo MACE demostró un rendimiento superior, logrando una RMSD de 0.06 ppm para los desplazamientos químicos y ~10 cm⁻¹ para las frecuencias vibratorias.; Descriptores más simples como ACSF y SOAP, cuando se combinan con regresores apropiados, se acercaron a la precisión de MACE.; Un descriptor básico de distancia de enlace de hidrógeno resultó en valores de RMSD significativamente mayores en comparación con MACE.

Conclusiones:

  • El aprendizaje automático, en particular MACE, proporciona predicciones de alta precisión para las propiedades espectroscópicas del hielo.; Si bien los descriptores más simples son menos precisos, ofrecen transparencia y pueden ser adecuados para aplicaciones específicas.; El estudio destaca el potencial de los métodos computacionales para avanzar en la ciencia del hielo.