Download - Gerson J. Ferreira
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Gerson J. FerreiraJournal Club @ InFis / UFU
12/06/2015
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arXiv:1505.07364
spurious
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Nature, Scientific Reports 5, Article number: 8963
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Luz, escalas usuais:45 ns48 m
Com átomos de Hélio:20 us(momentum modes)
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- gotas de óleo
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- gotas de óleo David Bohm
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- gotas de óleo David Bohm
- Mundos paralelos:
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- gotas de óleo David Bohm
- Mundos paralelos:Mecânica quântica via
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- gotas de óleo David Bohm
- Mundos paralelos:Mecânica quântica via Lei de Newton
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- gotas de óleo David Bohm
- Mundos paralelos:Mecânica quântica via Lei de Newtongeneralizada…
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- gotas de óleo David Bohm
- Mundos paralelos:Mecânica quântica via Lei de Newtongeneralizada…… sem funções de onda
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Copenhagen
- gotas de óleo David Bohm
- Mundos paralelos:Mecânica quântica via Lei de Newtongeneralizada…… sem funções de onda
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Copenhagen
- gotas de óleo David Bohm
- Mundos paralelos:Mecânica quântica via Lei de Newtongeneralizada…… sem funções de onda
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= shut up and calculate!
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Attoclock
Chemical Physics 414 (2013) 84-91
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Quotes from the internet
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Quotes from the internetUntil their work, a number of attosecond phenomena could not be adequately explained, such as the time delay when a photon ionised an atom.
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Quotes from the internetUntil their work, a number of attosecond phenomena could not be adequately explained, such as the time delay when a photon ionised an atom.
"At that timescale the time an electron takes to quantum tunnel out of an atom was thought to be significant. But the mathematics says the time during tunneling is imaginary -- a complex number -- which we realised meant it must be an instantaneous process," said Professor Kheifets.
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Quotes from the internetUntil their work, a number of attosecond phenomena could not be adequately explained, such as the time delay when a photon ionised an atom.
"At that timescale the time an electron takes to quantum tunnel out of an atom was thought to be significant. But the mathematics says the time during tunneling is imaginary -- a complex number -- which we realised meant it must be an instantaneous process," said Professor Kheifets.
"A very interesting paradox arises, because electron velocity during tunneling may become greater than the speed of light. However, this does not contradict the special theory of relativity, as the tunneling velocity is also imaginary" said Dr Ivanov, who recently took up a position at the Center for Relativistic Laser Science in Korea.
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Quotes from the internet
“Physicists solve quantum tunneling mystery, found that
Until their work, a number of attosecond phenomena could not be adequately explained, such as the time delay when a photon ionised an atom.
"At that timescale the time an electron takes to quantum tunnel out of an atom was thought to be significant. But the mathematics says the time during tunneling is imaginary -- a complex number -- which we realised meant it must be an instantaneous process," said Professor Kheifets.
"A very interesting paradox arises, because electron velocity during tunneling may become greater than the speed of light. However, this does not contradict the special theory of relativity, as the tunneling velocity is also imaginary" said Dr Ivanov, who recently took up a position at the Center for Relativistic Laser Science in Korea.
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Quotes from the internet
“Physicists solve quantum tunneling mystery, found that quantum tunneling is an instantaneous process.”
Until their work, a number of attosecond phenomena could not be adequately explained, such as the time delay when a photon ionised an atom.
"At that timescale the time an electron takes to quantum tunnel out of an atom was thought to be significant. But the mathematics says the time during tunneling is imaginary -- a complex number -- which we realised meant it must be an instantaneous process," said Professor Kheifets.
"A very interesting paradox arises, because electron velocity during tunneling may become greater than the speed of light. However, this does not contradict the special theory of relativity, as the tunneling velocity is also imaginary" said Dr Ivanov, who recently took up a position at the Center for Relativistic Laser Science in Korea.
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Quotes from the internet
“Physicists solve quantum tunneling mystery, found that quantum tunneling is an instantaneous process.”
- Australian National University News
Until their work, a number of attosecond phenomena could not be adequately explained, such as the time delay when a photon ionised an atom.
"At that timescale the time an electron takes to quantum tunnel out of an atom was thought to be significant. But the mathematics says the time during tunneling is imaginary -- a complex number -- which we realised meant it must be an instantaneous process," said Professor Kheifets.
"A very interesting paradox arises, because electron velocity during tunneling may become greater than the speed of light. However, this does not contradict the special theory of relativity, as the tunneling velocity is also imaginary" said Dr Ivanov, who recently took up a position at the Center for Relativistic Laser Science in Korea.
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Attoclock
Potencial confinante do átomo de hidrogênio+Campo elétrico girante
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Attoclock
Potencial confinante do átomo de hidrogênio+Campo elétrico girante
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Attoclock
Potencial confinante do átomo de hidrogênio+Campo elétrico girante
Laser: 800 nm, T ~ 6 fs
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Cold Target Recoil Ion Momentum Spectrometer (COLTRIMS)
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Attoclock – trajetória após tunelamento
Queremos achar o instante do tunelamento através da medida da distribuição angular de momento detectada
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Attoclock – trajetória após tunelamento
Queremos achar o instante do tunelamento através da medida da distribuição angular de momento detectada
Analytical R-Matrix (ARM) method
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Attoclock – hipóteses usuais
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Attoclock – hipóteses usuais
(A1) “t = 0”
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Attoclock – hipóteses usuais
(A1) “t = 0”É definido como o ponto de intensidade máxima do campo elétrico
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Attoclock – hipóteses usuais
(A1) “t = 0”É definido como o ponto de intensidade máxima do campo elétricoCorresponde aos instantes de máxima probabilidade de tunelamento
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Attoclock – hipóteses usuais
(A1) “t = 0”É definido como o ponto de intensidade máxima do campo elétricoCorresponde aos instantes de máxima probabilidade de tunelamento
(A2) tunelamento: elétron atravessou a barreira do campo elétrico no instante t.
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Attoclock – hipóteses usuais
(A1) “t = 0”É definido como o ponto de intensidade máxima do campo elétricoCorresponde aos instantes de máxima probabilidade de tunelamento
(A2) tunelamento: elétron atravessou a barreira do campo elétrico no instante t.(A3) Segue trajetória ARM com momento inicial
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Attoclock – hipóteses usuais
(A1) “t = 0”É definido como o ponto de intensidade máxima do campo elétricoCorresponde aos instantes de máxima probabilidade de tunelamento
(A2) tunelamento: elétron atravessou a barreira do campo elétrico no instante t.(A3) Segue trajetória ARM com momento inicial
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Attoclock – hipóteses usuais
(A1) “t = 0”É definido como o ponto de intensidade máxima do campo elétricoCorresponde aos instantes de máxima probabilidade de tunelamento
(A2) tunelamento: elétron atravessou a barreira do campo elétrico no instante t.(A3) Segue trajetória ARM com momento inicial
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Attoclock – hipóteses usuais
(A1) “t = 0”É definido como o ponto de intensidade máxima do campo elétricoCorresponde aos instantes de máxima probabilidade de tunelamento
(A2) tunelamento: elétron atravessou a barreira do campo elétrico no instante t.(A3) Segue trajetória ARM com momento inicial
Ângulo da trajetória mede o instante do tunelamento
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Attoclock – desvios do ângulo q=0
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Attoclock – desvios do ângulo q=0
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Attoclock – desvios do ângulo q=0
Tunnelling delaysAngular difference between the maximum of the electric laser field, which induces the highest ionization rate, and the direction of the laser field when the electron exits the tunnel.
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Attoclock – simulaçõesÂngulo central da distribuição com correções devido
ao formato do pulso e atração Coulombiana do átomo
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Attoclock – simulaçõesÂngulo central da distribuição com correções devido
ao formato do pulso e atração Coulombiana do átomo
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Attoclock – simulaçõesÂngulo central da distribuição com correções devido
ao formato do pulso e atração Coulombiana do átomo
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Attoclock – simulaçõesÂngulo central da distribuição com correções devido
ao formato do pulso e atração Coulombiana do átomo
YUKAWA
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Attoclock – simulaçõesÂngulo central da distribuição com correções devido
ao formato do pulso e atração Coulombiana do átomo
YUKAWA
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Attoclock – extraindo t-ionização do cálculo numéricoInstante da ionização com correções devido
ao formato do pulso e atração Coulombiana do átomo
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Attoclock – extraindo t-ionização do cálculo numéricoInstante da ionização com correções devido
ao formato do pulso e atração Coulombiana do átomo
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Attoclock – extraindo t-ionização do cálculo numéricoInstante da ionização com correções devido
ao formato do pulso e atração Coulombiana do átomo
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Attoclock – outras correções
“Indeed, if the ground state population is significantly reduced before the peak of the laser field, the maximum ionization signal may precede the field maximum.”
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Attoclock – outras correções
“Indeed, if the ground state population is significantly reduced before the peak of the laser field, the maximum ionization signal may precede the field maximum.”
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“… is consistent with the idea that the ionization process is not completed by the end of the tunnelling step. After the tunnelling step is completed, the electron may again be trapped by the ion, permanently or transiently (in which case it would again be re-released by the atom).”
Attoclock – outras correções
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Attoclock – Conclusões
É instantâneo?
Modelo numérico como “experimento ideal” para comparar com trajetórias ARM
Limite de validade do ARM e a descrição em termos de trajetórias?
Yukawa – ângulo zero para qualquer intensidade. Sempre adiabático?
Dependência com a frequência do laser?
Dinâmica temporal da densidade?