An experimental and theoretical investigation into positron and electron scattering from formaldehyde


Autoria(s): ZECCA, A.; TRAINOTTI, E.; CHIARI, L.; GARCIA, G.; BLANCO, F.; BETTEGA, M. H. F.; Varella, Marcio Teixeira do Nascimento; LIMA, M. A. P.; BRUNGER, M. J.
Contribuinte(s)

UNIVERSIDADE DE SÃO PAULO

Data(s)

20/10/2012

20/10/2012

2011

Resumo

We report on measurements of total cross sections (TCSs) for positron scattering from the fundamental organic molecule formaldehyde (CH(2)O). The energy range of these measurements was 0.26-50.3 eV, whereas the energy resolution was similar to 260 meV. To assist us in interpreting these data, Schwinger multichannel level calculations for positron elastic scattering from CH(2)O were also undertaken (0.5-50 eV). These calculations, incorporating an accurate model for the target polarization, are found to be in good qualitative agreement with our measured data. In addition, in order to compare the behaviour of positron and electron scattering from this species, independent atom model-screened additivity rule theoretical electron TCSs, now for energies in the range 1-10 000 eV, are also reported.

ARC

ARC

Spanish Ministerio de Ciencia e Innovacion[FIS2009-10245]

Spanish Ministerio de Ciencia e Innovacion

EU[MP1002]

EU

EU

EU[CM0601]

Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)

Brazilian agency Conselho Nacional de Desenvolvimento Cientifico e Tecnologico (CNPq)

FINEP[CT-Infra]

Financiadora de Estudos e Projetos (FINEP)

Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)

FAPESP

Identificador

JOURNAL OF PHYSICS B-ATOMIC MOLECULAR AND OPTICAL PHYSICS, v.44, n.19, 2011

0953-4075

http://producao.usp.br/handle/BDPI/29181

10.1088/0953-4075/44/19/195202

http://dx.doi.org/10.1088/0953-4075/44/19/195202

Idioma(s)

eng

Publicador

IOP PUBLISHING LTD

Relação

Journal of Physics B-atomic Molecular and Optical Physics

Direitos

restrictedAccess

Copyright IOP PUBLISHING LTD

Palavras-Chave #SCHWINGER MULTICHANNEL METHOD #POLYATOMIC-MOLECULES #VIBRATIONAL-EXCITATION #ANNIHILATION DYNAMICS #INTERACTION-MODEL #CROSS-SECTIONS #IMPACT #ENVIRONMENTS #COLLISIONS #METHANE #Optics #Physics, Atomic, Molecular & Chemical
Tipo

article

original article

publishedVersion