FOTÓLISE DE GELO DE ÁGUA POR RAIOS-X MOLES E A PRODUÇÃO DE H2O2 DURANTE AS FASES DE IRRADIAÇÃO E AQUECIMENTO
DOI:
https://doi.org/10.18066/revistaunivap.v29i61.4386Palabras clave:
Gelos astrofísicos, H2O, H2O2, Espectroscopia IR, Fotólise, Raios-X molesResumen
Gelos astrofísicos ricos em H2O (água) estão sempre expostos a radiações ionizantes no espaço, assim como a eventuais mudanças de temperatura. Seus estudos em laboratório permitem compreender seus comportamentos e mudanças químicas, além de permitir a quantificação de parâmetros físico-químicos importantes do próprio gelo. No presente trabalho, uma amostra de gelo de água a 12 K foi irradiada por raios-X moles na linha de luz SGM do LNLS/CNPEM até atingir o equilíbrio químico, e em seguida, foi aquecida até 220 K. Utilizando espectroscopia infravermelha (IR), mapeamos a evolução química da amostra e quantificamos a produção do seu principal produto, a molécula de H2O2. O estudo tem implicações na química das regiões de formação estelar, bem como em regiões frias do sistema solar.
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